A viewer's guide to tonight's first Democratic debate

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Why Hillary Won't Go After Bernie Sanders

A viewer's guide to tonight's debate: Tonight's Democratic presidential debate from Las Vegas won't look anything like the first two Republican debates. It will be smaller (just five candidates are participating). There will be no undercard debate. And, of course, there will be no Donald Trump. Below is our guide for what each candidate needs to accomplish in tonight's first Dem debate, which starts at 9:00 pm ET:

- Hillary Clinton: The Democratic frontrunner is never going to win a fight over who's the true progressive in the race (see her TPP flip-flop), so she has two goals: One, demonstrate that she is, by far, the best Democrat on that stage -- for Iowa and New Hampshire, as well as the general election. Two, she needs to exude passion and be the dogged policy wonk. And don't ignore this image: The stage will consist of her and four white men. Just like we saw with Carly Fiorina in the GOP debates, that kind of contrast can pack a punch. Her biggest worry tonight is not the other candidates; it's likely the moderators. It will be interesting to see if she tries to use BERNIE as a foil to prove her general election viability -- think his I'm-not-a-capitalist remark.

- Bernie Sanders: He simply has to come across as electable. Sure, he's faring well in many general-election polls right now. But make no mistake: His comment on "Meet the Press" Sunday that he's not a capitalist isn't a winning general-election message, especially when being a socialist running for president is more unpopular than being a Muslim or an atheist. Another question we have: How does Sanders hold up over two hours of debate? One way to judge tonight's debate is to gauge who does a better job shoring up his/her weakness -- Clinton's not-always progressive views vs. Sanders' electability doubts.

Sanders on the campaign trail:

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Bernie Sanders on the campaign trail
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A viewer's guide to tonight's first Democratic debate
PHOENIX, AZ - MARCH 15: Democratic presidential candidate Sen. Bernie Sanders (D-VT) speaks to a crowd gathered at the Phoenix Convention Center during a campaign rally on March 15, 2016 in Phoenix, Arizona. Hillary Clinton won the Democratic primary elections in Florida, North Carolina and Ohio, while Missouri and Illinois remain tight races. (Photo by Ralph Freso/Getty Images)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt, pumps his fist as he arrives for at a rally at the Macomb Community College, Saturday, March 5, 2016, in Warren, Mich. (AP Photo/Carlos Osorio)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt, speaks at the FOX News town hall at the Gem Theatre, Monday, March 7, 2016, in Detroit. (AP Photo/Carlos Osorio)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., waves as he leaves a news conference after voting in the Vermont primary at the Robert Miller Community and Recreation Center in Burlington, Vermont, Tuesday, March 1, 2016, on Super Tuesday. (AP Photo/Jacquelyn Martin)???
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., right, and his wife, Jane arrive for a rally in Norfolk, Va., Tuesday, Feb. 23, 2016. (AP Photo/Steve Helber)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt. smiles while speaking at the Kansas City Convention Center during a campaign event in Kansas City, Mo., Wednesday, Feb. 24, 2016. (AP Photo/Jacquelyn Martin)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., right, meets 3-month-old Oliver Lomas, of Venice, Calif., who was dressed as Sanders during a rally at Bonanza High School, on Sunday, Feb. 14, 2016, in Las Vegas. (AP Photo/Evan Vucci)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt. speaks during a canvass kick-off event at the Reno Sparks Convention Center, Saturday, Feb. 13, 2016, in Reno, Nev. (AP Photo/Evan Vucci)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks to a crowd outside of a rally at Bonanza High School, on Sunday, Feb. 14, 2016, in Las Vegas. (AP Photo/Evan Vucci)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., boards his plane for a campaign rally in Las Vegas, on Sunday, Feb. 14, 2016, in Denver. (AP Photo/Evan Vucci)
The Rev. Al Sharpton talks with Democratic presidential candidate Sen. Bernie Sanders, I-Vt. as they sit down for a breakfast meeting at Sylvia's Restaurant, Wednesday, Feb. 10, 2016, in the Harlem neighborhood of New York. Sanders defeated former Secretary of State Hillary Clinton on Tuesday in the New Hampshire primary. (AP Photo/Richard Drew)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., reacts to the cheering crowd at his primary night rally Tuesday, Feb. 9, 2016, in Manchester, N.H. (AP Photo/J. David Ake)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., poses for a selfie during a campaign rally on Sunday, Jan. 31, 2016, in Waterloo, Iowa. (AP Photo/Evan Vucci)
DES MOINES, IA - JANUARY 26: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to the media after holding a campaign event with United Steelworkers Local 310L, on January 26, 2016 in Des Moines, Iowa. Sanders continues his quest to become the Democratic presidential nominee.. (Photo by Joe Raedle/Getty Images)
TOPSHOT - US Senator and Democratic Presidential Candidate Bernie Sanders speaks during a campaign event at the University of Northern Iowa in Cedar Falls, Iowa, January 24, 2016, ahead of the Iowa Caucus. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during a CNN town hall at Drake University in Des Moines, Iowa, Monday, Jan. 25, 2016. (AP Photo/Patrick Semansky)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt. jokes with members of the media and pretends to slip as he steps off his bus before speaking at a town hall, Tuesday, Jan. 19, 2016, at Santa Maria Winery in Carroll, Iowa. (AP Photo/Andrew Harnik)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., leaves after speaking to a crowded room during a campaign stop Monday, Jan. 18, 2016, in Birmingham, Ala. (AP Photo/Brynn Anderson)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., center, is joined by his wife Jane, right, and grandchildren, Dylan, 4, and Ella, 7, on stage after speaking at a town hall at the Orpheum Theater in Sioux City, Iowa, Tuesday, Jan. 19, 2016. (AP Photo/Andrew Harnik)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, participates in the Democratic presidential candidate debate in Charleston, South Carolina, U.S., on Sunday, Jan. 17, 2016. Hours before Sunday's Democratic debate, the two top Democratic contenders held a warm-up bout of sorts in multiple separate appearances on political talk shows, at a time when the polling gap between the pair has narrowed in early-voting states. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
NEW YORK, NY - JANUARY 05: Democratic presidential candidate Sen. Bernie Sanders (I-VT) shakes hands with supporters after outlining his plan to reform the U.S. financial sector on January 5, 2016 in New York City. Sanders is demanding greater financial oversight and greater government action for banks and individuals that break financial laws. (Photo by Andrew Burton/Getty Images)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., listens during a news conference on Capitol Hill in Washington, Thursday, Dec. 3, 2015, to discuss gun control and related amendments to the reconciliation bill. (AP Photo/Jacquelyn Martin)
Democratic presidential candidates Bernie Sanders at the NHDP annual Jefferson Jackson dinner in Manchester, N.H., Sunday, Nov. 29, 2015. (AP Photo/Cheryl Senter)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., steps onstage to speak at a campaign event at the Fox Theatre, Monday, Nov. 23, 2015, in Atlanta. (AP Photo/David Goldman)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt. left, sits with rapper Killer Mike at The Busy Bee Cafe Monday, Nov. 23, 2015, in Atlanta. Killer Mike is scheduled to introduce Sanders at a campaign event at the Fox Theatre later in the evening. (AP Photo/David Goldman)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at a campaign event at the Fox Theatre Monday, Nov. 23, 2015, in Atlanta. (AP Photo/David Goldman)
The crowd cheers as Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at a campaign event at the Fox Theatre Monday, Nov. 23, 2015, in Atlanta. (AP Photo/David Goldman)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at a campaign event at the Fox Theatre Monday, Nov. 23, 2015, in Atlanta. (AP Photo/David Goldman)
Supporters for Democratic presidential candidate Sen. Bernie Sanders, I-Vt., cheer at the Jenkins Orphanage in North Charleston, S.C., Saturday, Nov. 21, 2015, during the Blue Jamboree event. (AP Photo/Mic Smith)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at Georgetown University in Washington, Thursday, Nov. 19, 2015, about the meaning of "democratic socialism" and other topics. (AP Photo/Carolyn Kaster)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., pauses to wipe his brow as he speaks at Georgetown University in Washington, Thursday, Nov. 19, 2015, about the meaning of "democratic socialism" and other topics. (AP Photo/Carolyn Kaster)
LEBANON, NH - NOVEMBER 11: Presidential candidate Bernie Sanders (I-VT) marches in the Veterans Day Parade November 11, 2015 in Lebanon, New Hampshire. Sanders goes into the Democrats second debate this weekend still running strong in the polls.(Photo by Darren McCollester/Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks at the Congressional Hispanic Caucus Institute conference in Washington, D.C., U.S., on Wednesday, Oct. 7, 2015. While next Tuesday's first Democratic presidential debate will probably lack the name-calling and sharp jabs of the Republican face-offs, there's still potential for strong disagreements between the party's leading contenders. Photographer: Andrew Harrer/Bloomberg via Getty Images
Democratic Presidential candidate Senator Bernie Sanders speaks about the Workplace Democracy Act on Capitol Hill in Washington, DC on October 6, 2015. AFP PHOTO/JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt, speaks during a campaign rally in Springfield, Mass., Saturday, Oct. 3, 2105. (AP Photo/Michael Dwyer)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during the Des Moines Youth Summit, Sunday, Sept. 27, 2015, at Creative Visions in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
NEW YORK, NY - SEPTEMBER 18: Senator Bernie Sanders at Late Show with Stephen Colbert at the Ed Sullivan Theatre in New York City on September 18, 2015. Credit: RW/MediaPunch/IPX
US Senator from Vermont and Democratic presidential candidate Bernie Sanders addresses striking low-wage contract workers from the US Capitol and religious leaders at the Lutheran Church of the Reformation in Washington, DC, on September 22, 2015 for an interfaith service ahead of the arrival of Pope Francis for a six-day visit to the US. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
MANCHESTER, NH - SEPTEMBER 19: Democratic Presidential candidate Senator Bernie Sanders (I-VT) talks on stage during the New Hampshire Democratic Party State Convention on September 19, 2015 in Manchester, New Hampshire. Five Democratic presidential candidates are all expected to address the crowd inside the Verizon Wireless Arena. (Photo by Scott Eisen/Getty Images)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., waves as he marches with supporters in the Labor Day parade Monday, Sept. 7, 2015, in Milford, N.H. (AP Photo/Jim Cole)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during a television interview before a town hall meeting, Thursday, Sept. 3, 2015, in Grinnell, Iowa. (AP Photo/Charlie Neibergall)
Democratic presidential candidate, Sen. Bernie Sanders, I -Vt., reacts during a fundraiser reception Monday, Aug. 17, 2015, in Chicago. (AP Photo/Christian K. Lee)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., greets supporters during the opening of his Cedar Rapids field headquarters, Sunday, Aug. 16, 2015, in Marion, Iowa. (AP Photo/Charlie Neibergall)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at the Iowa at the Iowa State Fair Saturday, Aug. 15, 2015, in Des Moines. (AP Photo/Charlie Riedel)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at the Iowa Democratic Wing Ding at the Surf Ballroom Friday, Aug. 14, 2015, in Clear Lake, Iowa. (AP Photo/Charlie Riedel)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at a rally, Monday, Aug. 10, 2015, at the Los Angeles Memorial Sports Arena in Los Angeles. (AP Photo/Ringo H.W. Chiu)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., lifts his arms in celebration as he speaks at a rally, Sunday, Aug. 9, 2015, at the Moda Center in Portland, Ore. (AP Photo/Troy Wayrynen)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., during a visit to the National Nurses United office Monday, Aug. 10, 2015, in Oakland, Calif. (AP Photo/Eric Risberg)
A supporter takes a photo with Democratic presidential candidate Sen. Bernie Sanders, I-Vt., left, at a rally, Sunday, Aug. 9, 2015, at the Moda Center in Portland, Ore. (AP Photo/Troy Wayrynen)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., smiles before a rally Saturday, Aug. 8, 2015, in downtown Seattle. The afternoon rally was the first of several weekend appearances by Sanders in Seattle and Portland. (AP Photo/Elaine Thompson)
Nurses take "selfies" with Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., after her spoke at a rally with registered nurses and other community leaders on the 50th anniversary of Medicare and Medicaid, Thursday, July 30, 2015, on Capitol Hill in Washington. (AP Photo/Jacquelyn Martin)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at the 2015 International Association of Sheet Metal, Air, Rail, and Transportation Workers (SMART) Conference, Tuesday, July 28, 2015, in Washington. (AP Photo/Jacquelyn Martin)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., joined by federal contract workers, speaks during a rally on Capitol Hill in Washington, Wednesday, July 22, 2015, to push for a raise to the minimum wage to $15 an hour. (AP Photo/Andrew Harnik)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., gives an opening statement at a Netroots Nation town hall meeting, Saturday, July 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., waits to speak at the Alliance for Retired Americans 2015 National Legislative Conference in Washington, Thursday, July 9, 2015. (AP Photo/Molly Riley)
Sen. Bernie Sanders, I-Vt., speaks to the media about his agenda in running for president, Thursday, April 30, 2015, on Capitol Hill in Washington. (AP Photo/Jacquelyn Martin)
Democratic Presidential candidate Sen. Bernie Sanders, I-Vt., poses for a portrait before an interview, Wednesday May 20, 2015, in Washington. (AP Photo/Jacquelyn Martin)
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- Martin O'Malley: The former Maryland governor simply needs to find a moment to finally break through, especially with a new Washington Post poll showing him registering at just 4% in his home state of Maryland (!!!). Here's something to chew on: Does O'Malley target Clinton, or does he instead go after Sanders (who may very well be O'Malley's biggest threat in this Democratic field)?

- Jim Webb: The former Virginia senator needs a strong performance/moment to simply get his credibility back. You'd be forgiven if you forget that Webb is still running for the presidency, given how few events he's done compared with the competition. Webb is a serious politician with serious ideas. But this presidential contest -- so far -- hasn't helped his reputation; it has diminished him. And knowing Webb, it bugs him that he hasn't been able to get traction on income inequality, an issue he believes he put on the table before any other mainstream Dem (see his 2007 State of the Union response). He may let his irritation show which won't be a good first impression. By the way, it will be striking when the Iran deal conversation comes up, because Webb is one Democrat who has doubts about it.

- Lincoln Chafee: What the former Rhode Island governor and senator needs to accomplish is give a rationale for his candidacy -- other than his opposition to the Iraq war (which was a rationale from eight years ago but not now) and his enthusiastic embrace of the Metric system.Hillary is an experienced -- and aggressive -- debater: Despite Hillary Clinton's rough last few months as a presidential candidate, don't forget this fact: She's a strong, experienced, and aggressive debater. She's not only the sole Democrat on tonight's stage who has participated in presidential debates before (some 20-plus during the 2007-2008 cycle), but she more often than not was the best performer in them. Indeed, with one key exception (the Oct. 30, 2007 Philly debate over drivers licenses for undocumented immigrants), Clinton emerged unscathed from all of those Dem debates, and she was a bulldog when going on the offensive -- see the Feb. 26, 2008 NBC/MSNBC debate over NAFTA and health care, the Jan. 21, 2008 CNN debate hitting Obama for praising Ronald Reagan, or the April 16, 2008 ABC debate blasting Obama for his bitter/guns remark.

- But the Clinton campaign is focusing more on next week's Benghazi committee than tonight's debate: Even though tonight's debate is a big moment for Clinton and her campaign, we have it on good authority that her team is making more preparations about next week's Benghazi committee appearance than tonight's debate. Indeed, her Oct. 22 testimony could very well be her most important event in this important month of October. And don't miss Politico's tick-tock on how the Clinton campaign has handled -- or mishandled -- the email controversy over the past seven months. One under-read part of the story: How both Clintons (Hillary and Bill) seem to missing an uber-strategist to help hold their hands during this campaign.

See more from Clinton's campaign:

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Hillary Clinton's 2016 campaign
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A viewer's guide to tonight's first Democratic debate
BALTIMORE, MD - APRIL 10: Democratic presidential candidate Hillary Clinton holds a campaign rally at City Garage April 10, 2016 in Baltimore, Maryland. Voters will head to polling places for Maryland's presidential primary April 26. (Photo by Chip Somodevilla/Getty Images)
Democratic U.S. presidential candidate Hillary Clinton laughs as she listens to Representative Steve Israel (D-NY) speak on a gun control panel in Port Washington, New York April 11, 2016. REUTERS/Lucas Jackson
NEW YORK, NY - APRIL 09: Democratic presidential candidate Hillary Clinton holds a Latino organizing event on April 9, 2016 while campaigning in the Brooklyn Borough of New York City. The New York Democratic primary is scheduled for April 19th. (Photo by Andrew Renneisen/Getty Images)
SPRINGFIELD, MA - FEBRUARY 29: Democratic presidential candidate former Secretary of State Hillary Clinton speaks during a 'Get Out The Vote' rally at the Lyman & Merrie Wood Museum of Springfield History on February 29, 2016 in Springfield, Massachusetts. Hillary Clinton is campaigning in Massachusetts and Virginia ahead of Super Tuesday. (Photo by Justin Sullivan/Getty Images)
BOSTON, MA - Former Secretary of State Hillary Clinton speaks to supporters at the Old South Meeting Hall during a rally in Boston, Massachusetts on Monday February 29, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)
MINNEAPOLIS, MN - MARCH 01: Democratic presidential candidate former Secretary of State Hillary Clinton greets patrons at Mapps Coffee on March 1, 2016 in Minneapolis, Minnesota. Hillary Clinton is campaigning in Minnesota as Super Tuesday voting takes place in 12 states. (Photo by Justin Sullivan/Getty Images)
Democratic presidential candidate Hillary Clinton greets supporters as she arrives at a rally at Abraham Lincoln High School in Des Moines, Iowa, Sunday, Jan. 31, 2016. (AP Photo/Andrew Harnik)
Democratic presidential candidate Hillary Clinton speaks at a rally at Abraham Lincoln High School in Des Moines, Iowa, Sunday, Jan. 31, 2016. (AP Photo/Andrew Harnik)
Democratic presidential candidate Hillary Clinton, accompanied by her daughter Chelsea Clinton, reacts to applause as she arrives for a rally at Abraham Lincoln High School in Council Bluffs, Iowa, Sunday, Jan. 31, 2016. (AP Photo/Andrew Harnik)
Democratic presidential candidate Hillary Clinton, left, hugs Annette Bebout, 73, of Newton, during a campaign event at Berg Middle School, Thursday, Jan. 28, 2016 in Newton, Iowa. Bebout told her story of how she lost her home to the audience. (AP Photo/Paul Sancya)
Democratic presidential candidate Hillary Clinton, accompanied by former President Bill Clinton, right, and their daughter Chelsea Clinton, left, arrives to speak at a rally at Washington High School in Cedar Rapids, Iowa, Saturday, Jan. 30, 2016. (AP Photo/Andrew Harnik)
Democratic presidential candidate Hillary Clinton speaks at a rally at BR Miller Middle School in Marshalltown, Iowa, Tuesday, Jan. 26, 2016. (AP Photo/Andrew Harnik)
Democratic presidential candidate, Hillary Clinton makes a point during the Brown & Black Forum, Monday, Jan. 11, 2016, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Democratic presidential candidate Hillary Clinton, right, and high school teacher David Swaney laugh about their colorful outfits before Swaney asks Clinton a question during a town hall at NewBo City Market in Cedar Rapids, Iowa, Monday, Jan. 4, 2016. (AP Photo/Patrick Semansky)
Democratic presidential candidate Hillary Clinton reacts to applause from the audience while standing with Brenda Bouchard, an Alzheimer's research advocate, during a town hall style campaign event, Tuesday, Dec. 29, 2015, at South Church in Portsmouth, N.H. (AP Photo/Steven Senne)
Democratic presidential candidate Hillary Clinton speaks about her counterterrorism strategy during a speech at the University of Minnesota Tuesday, Dec. 15, 2015, in Minneapolis. (AP Photo/Charlie Neibergall)
Democratic presidential candidate Hillary Clinton meets local residents at Apple Orchard Cafe Friday, Dec. 4, 2015, in Fort Dodge, Iowa. (AP Photo/Charlie Neibergall)
Hillary Rodham Clinton reacts as she talks to supporters after a Democratic presidential primary debate, Saturday, Nov. 14, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Democratic presidential candidate Hillary Rodham Clinton greets supporters before speaking at a campaign rally in Boulder, Colo., Tuesday, Nov. 24, 2015. (AP Photo/Brennan Linsley
Democratic presidential candidate Hillary Rodham Clinton smiles as she arrives to speak at a town hall meeting Sunday, Nov. 22, 2015, in Clinton, Iowa. (AP Photo/Charlie Neibergall)
Democratic presidential candidate Hillary Rodham Clinton speaks from a gymnasium side porch to people who weren't able to fit in to hear her speech at Fisk University Friday, Nov. 20, 2015, in Nashville, Tenn. (AP Photo/Mark Humphrey)
Democratic presidential candidate Hillary Rodham Clinton shakes hand with a supporter during a town hall meeting Tuesday, Nov. 3, 2015, in Coralville, Iowa. (AP Photo/Charlie Neibergall)
Democratic presidential candidate Hillary Rodham Clinton speaks to customers at the White Mountain Cafe & Bookstore, Thursday, Oct. 29, 2015, in Gorham, N.H. (AP Photo/Robert F. Bukaty)
Democratic presidential candidate Hillary Rodham Clinton speaks during a meeting of the Alabama Democratic Conference in Hoover, Ala., Saturday, Oct. 17, 2015. Clinton tells black Alabama Democrats that she'd champion voting rights in the White House. She says Republicans are dismantling the progress of the civil rights movement. (AP Photo/Mark Almond)
MOUNT VERNON, IOWA - OCTOBER 7: Former Secretary of State Hillary Clinton speaks to voters during an outdoor town hall meeting at Cornell College in Mount Vernon, Iowa on Wednesday October 7, 2015. (Photo by Melina Mara/The Washington Post via Getty Images)
Democratic presidential candidate Hillary Rodham Clinton reacts to a supporter before speaking at a community forum, Tuesday, Oct. 6, 2015, in Davenport, Iowa. (AP Photo/Charlie Neibergall)
MUSCATINE, IOWA - OCTOBER 6: Former Secretary of State Hillary Clinton speaks to a voter before leaving a farm in Muscatine, Iowa on Tuesday October 6, 2015. (Photo by Melina Mara/The Washington Post via Getty Images)
MANCHESTER, NH - OCTOBER 05: Democratic presidential candidate Hillary Rodham Clinton holds a town hall meeting at the Manchester Community College on October 5, 2015 in Manchester, New Hampshire. Clinton spoke about the need for gun control on the wake of a mass shooting at another community college in Oregon. (Photo by Alfredo Sosa/The Christian Science Monitor via Getty Images)
Democratic presidential candidate Hillary Rodham Clinton gestures as she speaks at Human Rights Campaign gathering in Washington, Saturday, Oct. 3, 2015. ( AP Photo/Jose Luis Magana)
DAVIE, FL - OCTOBER 02: Democratic presidential candidate Hillary Clinton speaks about gun control during her campaign stop at the Broward College à Hugh Adams Central Campus on October 2, 2015 in Davie, Florida. Hillary Clinton continues to campaign for the nomination of the Democratic Party as their presidential candidate. (Photo by Joe Raedle/Getty Images)
Democratic presidential candidate Hillary Rodham Clinton speaks at a grassroots organizing meeting at Philander Smith College Monday, Sept. 21, 2015, in Little Rock, Ark. (AP Photo/Gareth Patterson)
WASHINGTON, DC - SEPTEMBER 19: Hillary Clinton attends the Phoenix Awards Dinner at the 45th Annual Legislative Black Caucus Foundation Conference at Walter E. Washington Convention Center on September 19, 2015 in Washington, DC. (Photo by Earl Gibson III/Getty Images)
MANCHESTER, NH - SEPTEMBER 19: Democratic presidential candidate Hillary Clinton claps on stage during the New Hampshire Democratic Party Convention at the Verizon Wireless Center on September 19, 2015 in Manchester, New Hampshire. Challenger for the democratic vote Sen. Bernie Sanders (I-VT) has been gaining ground on Clinton in Iowa and New Hampshire. (Photo by Scott Eisen/Getty Images)
PORTLAND, ME - SEPTEMBER 18: Hillary Clinton brings her Democratic presidential campaign to Maine for the first time, speaking at King Middle School. Clinton is welcomed as she is introduced at the event. (Photo by Derek Davis/Portland Press Herald via Getty Images)
CEDAR RAPIDS, IA - SEPTEMBER 7: Democratic Presidential hopeful Hillary Clinton takes time to meet supporters and take photos at the Annual Hawkeye Labor Council AFL-CIO Labor Day picnic on September 7, 2015 at Hawkeye Downs in Cedar Rapids, Iowa. Clinton spent a busy Labor Day weekend in Iowa, meeting supporters throughout the state while trying to maintain a lead over Bernie Sanders for the Democratic nomination. (Photo by David Greedy/Getty Images)
US Democratic presidential candidate Hillary Clinton takes part in a discussion after speaking about the Iran nuclear deal at the Brookings Institution in Washington, DC, on September 9, 2015. Clinton expressed firm support for the nuclear accord with Iran, calling it flawed but still strong. Clinton added that the agreement must be strictly enforced and said that if elected president next year, she would not hesitate to use military force if Iran fails to live up to its word and tries to develop a bomb. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
PORTSMOUTH, NH - SEPTEMBER 5: Democratic presidential candidate Hillary Clinton and U.S. Senator Jeanne Shaheen take an off the schedule stop in the River Run Bookstore before shaking hands with onlookers on September 5, 2015 in Portsmouth, New Hampshire. (Photos by Charles Ommanney/The Washington Post via Getty Images)
PORTSMOUTH, NH - SEPTEMBER 5: Democratic Presidential candidate Hillary Clinton receives an endorsement from U.S. Senator Jeanne Shaheen (D-NH) September 5, 2015 in Portsmouth, New Hampshire. Clinton attended a Women for Hillary event at Portsmouth High School. (Photo by Darren McCollester/Getty Images)
PORTSMOUTH, NH - SEPTEMBER 5: Democratic Presidential candidate Hillary Clinton walks downtown Portsmouth and takes pictures with people September 5, 2015 in Portsmouth, New Hampshire. Clinton attended a Women for Hillary event at Portsmouth High School earlier in the day and received an endorsement from U.S. Senator Jeanne Shaheen (D-NH). (Photo by Darren McCollester/Getty Images)
LAS VEGAS, NEVADA - AUGUST 18: Former Secretary of State Hillary Clinton answers questions from journalists after speaking to north Las Vegas voters at a town hall meeting in Las Vegas, on Tuesday, August 18, 2015. The former Secretary was answering questions about emails sent and received a private server system, now in question, while she was the Secretary of State. (Photo by Melina Mara/The Washington Post via Getty Images)
UNITED STATES - August 15: Democratic presidential candidate Hillary Rodham Clinton greets fairgoers as she tours the Iowa State Fair in Des Moines, Iowa, on Saturday, August 15, 2015. (Photo By Al Drago/CQ Roll Call)
Democratic presidential candidate Hillary Rodham Clinton tours the Des Moines Area Rapid Transit Central Station with general manager Elizabeth Presutti, left, and building superintendent Keith Welch, Monday, July 27, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
CARROLL, IA - JULY 26: Democratic presidential hopeful and former Secretary of State Hillary Clinton speaks to guests gathered for a house party on July 26, 2015 in Carroll, Iowa. Although Clinton leads all other Democratic contenders, a recent poll had her trailing several of the Republican candidates in Iowa. (Photo by Scott Olson/Getty Images)
Democratic presidential hopeful Hillary Rodham Clinton greets supporters after a campaign event, Thursday, July 23, 2015 in Columbia, S.C. Clinton talked about what she said was a lack of educational and economic opportunities, and a criminal justice system that treats blacks more harshly than whites. (AP Photo/Stephen B. Morton)
Chelsea Galinos, 21, left, who painted a picture of the democratic presidential hopeful Hillary Rodham Clinton, right, greets Clinton after a campaign event in New York, Monday, July 13, 2015. (AP Photo/Seth Wenig)
Democratic presidential candidate Hillary Rodham Clinton speaks during a campaign stop at the Iowa City Public Library, Tuesday, July 7, 2015, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)
FILE - In this June 20, 2015, file photo, Democratic presidential candidate Hillary Rodham Clinton speaks at the U.S. Conference of Mayors 83rd Annual Meeting in San Francisco. Clinton’s presidential campaign jumped on the Supreme Court decision, changing its red campaign logo to a rainbow colored H, releasing a gauzy video of gay wedding ceremonies, and blasting out supportive tweets aimed at building its campaign list. But like President Barack Obama, such expressions of support mark a remarkable shift for Clinton, who opposed gay marriage for more than two decades as a first lady, a U.S. senator and a presidential candidate. (AP Photo/Mathew Sumner, File)
Democratic presidential candidate Hillary Rodham Clinton speaks to supporters during a rally, Sunday, June 14, 2015, in Des Moines, Iowa. Seeking an army of volunteers, Clinton is trying to build an organizational edge in Iowa as some of her lesser-known Democratic rivals clamor for attention in the state that tripped up her first presidential campaign. (AP Photo/Charlie Neibergall)
Democratic presidential candidate Hillary Rodham Clinton speaks to supporters during a rally, Sunday, June 14, 2015, in Des Moines, Iowa. Clinton's campaign has signaled Iowa will be the centerpiece of its ground game. (AP Photo/Charlie Neibergall)
Democratic presidential candidate former Secretary of State Hillary Rodham Clinton waves to supporters as her husband former President Bill Clinton, second from right, Chelsea Clinton, second from left, and her husband Marc Mezvinsky, join on stage Saturday, June 13, 2015, on Roosevelt Island in New York. (AP Photo/Frank Franklin II)
Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton speaks at the "Hillary For America" official campaign launch event at Four Freedoms Park, Roosevelt Island on Saturday, June 13, 2015, in New York. (Photo by Greg Allen/Invision/AP)
Supporters watch as democratic presidential candidate, former Secretary of State Hillary Rodham Clinton speaks Saturday, June 13, 2015, on Roosevelt Island in New York. (AP Photo/Frank Franklin II)
Democratic presidential candidate, former Secretary of State Hillary Rodham Clinton speaks to supporters Saturday, June 13, 2015, on Roosevelt Island in New York. (AP Photo/Frank Franklin II)
Democratic presidential candidate Hillary Rodham Clinton delivers a speech at Texas Southern University in Houston, Thursday, June 4, 2015. Clinton is calling for an expansion of early voting and pushing back against Republican-led efforts to restrict voting access, laying down a marker on voting rights at the start of her presidential campaign. (AP Photo/Pat Sullivan)
CHICAGO, IL - MAY 20: Democratic presidential hopeful and former Secretary of State Hillary Clinton arrives for a meeting with parents and child care workers at the Center for New Horizons on May 20, 2015 in Chicago, Illinois. Clinton arrived in Chicago after campaigning Monday and Tuesday in Iowa. (Photo by Scott Olson/Getty Images)
Democratic presidential candidate Hillary Rodham Clinton greets a local resident while visiting local shops on main street in Independence, Iowa, Tuesday, May 19, 2015. (AP Photo/Charlie Neibergall)
LAS VEGAS, NV - MAY 05: Democratic presidential candidate and former U.S. Secretary of State Hillary Clinton (C) poses with students and faculty after speaking at Rancho High School on May 5, 2015 in Las Vegas, Nevada. Clinton said that any immigration reform would need to include a path to 'full and equal citizenship.' (Photo by Ethan Miller/Getty Images)
Hillary Rodham Clinton, a 2016 Democratic presidential contender, steps to the podium to speak at the David N. Dinkins Leadership and Public Policy Forum, Wednesday, April 29, 2015, in New York. (AP Photo/Mark Lennihan)
NEW YORK, NY - APRIL 23: Hillary Rodham Clinton (L) and actress Maggie Gyllenhaal attend the 2015 DVF Awards at United Nations on April 23, 2015 in New York City. (Photo by Michael Stewart/FilmMagic)
NEW YORK, NY - APRIL 29: Democratic presidential hopeful and former Secretary of State Hillary Clinton speaks during the David N. Dinkins Leadership and Public Policy Forum at Columbia University April 29, 2015 in New York City. Clinton addressed the unrest in Baltimore, called for police body cameras and a reform to sentencing. (Photo by Kevin Hagen/Getty Images)
Democratic presidential candidate Hillary Rodham Clinton meets with employees at Whitney Brothers during a campaign stop, Monday, April 20, 2015, in Keene, N.H. (AP Photo/Jim Cole)

Hillary Clinton announced her campaign for president on Sunday April, 12, 2015 with a video on YouTube. 

(Screenshot from YouTube)

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- Before a non-liberal crowd, Sanders' remarks fell flat: At yesterday's "No Labels" confab in New Hampshire, our colleague Benjy Sarlin made this observation about Bernie Sanders' remarks to the moderate/centrist crowd: They fell flat. "Sanders, who also frequently speaks to crowds of thousands of frenzied supporters, addressed a less enthused audience during his video address. After a warm greeting, the room was mostly quiet, with a number filing out of their seats, texting on their phones or chatting with neighbors as he rattled off statistics about inequality." Sure, the addresses via video aren't going to play as well as those in person, but Sanders' performance was a reminder that he usually addresses crowds of liberals and progressives. According to our Sept. NBC/WSJ poll, only 31% of Americans identify themselves as being liberal - which means for Democratic candidates to win national elections, they have to over-perform with moderates, too. Can Sanders do that?

- Why Biden not participating in tonight's debate is a big deal: As expected, Vice President Joe Biden won't be participating at tonight's Democratic debate. Instead, he's attending meetings at the White House, per his schedule. We can't emphasize enough how big of a deal it is for Biden NOT to be on tonight's debate stage, because it dampens the enthusiasm he needs if he wants to get into the race. Per NBC's Kristen Welker, Biden was unable to reach a decision about his presidential plans after spending another weekend with his family, according to a source familiar with Biden's thinking. But as we wrote yesterday, the clock is ticking. And here's the New York Times: "The danger for Mr. Biden, as his advisers know all too well, is that intrigue can easily turn into fatigue. After 10 weeks of his being egged on by Democrats disenchanted with Mrs. Clinton and by a news media eager for a race to cover, Mr. Biden increasingly faces demands that he make up his mind."

- Waiting to decide until after the debate or Clinton's Benghazi testimony looks calculating: Biden waiting until after this debate to announce his presidential intentions -- and maybe even after Clinton's Benghazi committee testimony -- risks looking calculating. That said, the Biden source tells Welker that Biden is more likely trying to determine whether he and his family are emotionally ready, given the recent loss of his son Beau. Still, he can't wait forever, because that indecision doesn't help his party, Hillary Clinton, or even Biden himself, as we wrote yesterday. And Welker's source adds that Biden knows he has to decide soon.

- Jeb to focus on repealing and replacing Obamacare: Finally, on the GOP side today, NBC's Jordan Frasier reports: "Jeb Bush will call for repealing President Obama's healthcare law and lay out a three-point plan for replacing it Tuesday in New Hampshire, the latest in a string of policy proposals from the Republican presidential candidate. Bush's plan will focus on promoting innovation, lowering costs and deferring power to states, according to documents detailing the proposal. During a campaign call with donors and supporters, campaign officials said the plan reflects input from people throughout the healthcare industry and lays out a system they said is more suitable for the 21st century."

Related: See a recap of the most recent Republican debate:

31 PHOTOS
GOP Main Debate 9/16/2015
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A viewer's guide to tonight's first Democratic debate
Republican presidential hopefuls, (L-R) South Carolina Sen. Lindsay Graham, former New York Gov. George Pataki, Sen. Rick Santorum, Kentucky Sen. Rand Paul, former Arkansas Gov. Mike Huckabee, Florida Sen. Marco Rubio, Texas Sen. Ted Cruz, retired neurosurgeon Ben Carson, real estate magnate Donald Trump, former Florida Gov. Jeb Bush, Wisconsin Gov. Scott Walker, former CEO Carly Fiorina, Ohio Gov. John Kasich, and New Jersey Gov. Chris Christie, arrive on stage for the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015. Republican presidential candidates collectively turned their sights on frontrunner Donald Trump at the party's second debate, taking aim at his lack of political experience and his sometimes abrasive style. AFP PHOTO/ ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Republican presidential candidates businessman Donald Trump, left, and Scott Walker, right, both speak as Jeb Bush, listens during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential hopefuls (L-R), Kentucky Sen. Rand Paul, former Arkansas Gov. Mike Huckabee , Florida Sen. Marco Rubio, Texas Sen. Ted Cruz, real estate magnate Donald Trump, former Florida Gov. Jeb Bush, Wisconsin Gov. Scott Walker, and former CEO Carly Fiorina, listen as retired neurosurgeon Ben Carson (C) speaks during the Presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015. Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2015. AFP PHOTO / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Republican presidential candidate businessman Donald Trump speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
SIMI VALLEY, CA - SEPTEMBER 16: : Republican presidential candidates Mike Huckabee and Marco Rubio take part in the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
SIMI VALLEY, CA - SEPTEMBER 16: Republican presidential candidates Carly Fiorina and John Kasich take part in the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
SIMI VALLEY, CA-SEPTEMBER. 16: Republican presidential candidate Rand Paul take part in the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
Republican presidential candidate, Ohio Gov. John Kasich speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidates, former Florida Gov. Jeb Bush, right, and Donald Trump both speak during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidate, retired neurosurgeon Ben Carson speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
SIMI VALLEY, CA - SEPTEMBER 16: Republican presidential candidates (L-R) Rick Santorum, George Pataki, U.S. Sen. Rand Paul (R-KY), Mike Huckabee, U.S. Sen. Marco Rubio (R-FL) , U.S. Sen. Ted Cruz (R-TX), Ben Carson, Donald Trump, Jeb Bush, Wisconsin Gov. Scott Walker, Carly Fiorina, Ohio Gov. John Kasich and New Jersey Gov. Chris Christie stand onstage during the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates. (Photo by Sandy Huffaker/Getty Images)
Republican presidential candidate, New Jersey Gov. Chris Christie responds to a question as questioners Dana Bash, center, and Hugh Hewitt, right, look on during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidate, businessman Donald Trump reacts during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Carly Fiorina, former chairman and chief executive officer of Hewlett-Packard Co. and 2016 Republican presidential candidate, speaks during the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California, U.S., on Wednesday, Sept. 16, 2015. After a friendly round of introductions, the second Republican presidential debate quickly plunged into clashes that shifted from policy to the personal, with more politically experienced insiders trying to gain an advantage against the front-runner at center stage: Donald Trump. Photographer: Max Whittaker/Pool via Bloomberg
SIMI VALLEY, CA-SEPTEMBER. 16: Republican presidential candidates Marco Rubio, U.S. Sen. Ted Cruz (R-TX), Ben Carson, Donald Trump, Jeb Bush and Wisconsin Gov. Scott Walker take part in the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
Republican presidential candidate, former Florida Gov. Jeb Bush, center, gestures as Donald Trump, left, and Scott Walker look on during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidate, New Jersey Gov. Chris Christie speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidate, Sen. Marco Rubio, R-Fla., speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidate, Sen. Ted Cruz, R-Texas, left, looks on as Ben Carson speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
SIMI VALLEY, CA - SEPTEMBER 16: Republican presidential candidates Chris Christie (R) and Ohio Gov. John Kasich take part in the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
SIMI VALLEY, CA - SEPTEMBER 16: Republican presidential candidates Donald Trump (L) and Jeb Bush take part in the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
Republican presidential hopeful Jeb Bush speaks during the Republican Presidential Debate at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015. Republican presidential candidates collectively turned their sights on frontrunner Donald Trump at the party's second debate, taking aim at his lack of political experience and his sometimes abrasive style. AFP PHOTO / FREDERIC J BROWN (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)
Republican presidential candidate, former Arkansas Gov. Mike Huckabee, left, speaks as Marco Rubio looks on during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
SIMI VALLEY, CA-SEPTEMBER. 16: Republican presidential candidate Donald Trump takes part in the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
Republican presidential candidates Ben Carson, left, and Donald Trump talk before the start of the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
2016 Republican presidential candidates Carly Fiorina, former chairman and chief executive officer of Hewlett-Packard Co., and Scott Walker, governor of Wisconsin, walk on stage during the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California, U.S., on Wednesday, Sept. 16, 2015. The main debate of the top 11 GOP contenders in the polls follows the 'kids' table' debate of candidates who didn't make the cut. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
Republican presidential hopefuls, (L-R) retired neurosurgeon Ben Carson, real estate magnate Donald Trump, and former Florida Gov. Jeb Bush, arrive on stage for the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015. Republican presidential candidates collectively turned their sights on frontrunner Donald Trump at the party's second debate, taking aim at his lack of political experience and his sometimes abrasive style. AFP PHOTO/ ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Republican presidential candidates Chris Christie, right, John Kasich, center, and Carly Fiorina enter the stage prior to the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Chris Carlson)
SIMI VALLEY, CA - SEPTEMBER 16: Republican presidential candidate Donald Trump speaks with reporters after the presidential debate at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second of presidential debates(Photo by Sandy Huffaker/Getty Images)
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