Buffett takes to the stump as Clinton looks to shore up Iowa

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Billionaire Warren Buffett has long resisted calls to throw his massive wealth behind a campaign and even eschewed public rallies that would lend his vaunted reputation to a candidate.

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There are signs that's changing. While Buffett, 85, has yet to make a major financial contribution, he's taking the rare step of appearing Wednesday at a public event with Hillary Clinton. That rally is scheduled to follow a fundraiser for the presidential candidate in his hometown of Omaha, Nebraska, the second event he's headlining for her this month.

See Warren Buffett through the years:

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Buffett takes to the stump as Clinton looks to shore up Iowa
Investor Warren Buffett answers reporters' questions during a press conference to announce that Walt Disney will buy Capital Cities/ABC July 31.
Billionaire investor Warren Buffett of Omaha makes a rare public appearance during an autograph session outside Borsheim's Jewelry Store in Omaha, May 4. Buffett was signing autographs for shareholders in his company, Berkshire Hathaway, which is having its annual meeting May 5.
Billionaire businessman Warren Buffett sits with his wife Susan (R) and daughter Susie, prior to the annual Berkshire Hathaway shareholders meeting in Omaha, May 5. This marks a rare public appearance for the reclusive Buffett.
Arnold Schwarzenegger, Republican candidate for governor of California in the October 7, 2003 recall election listens as world famous investor, Warren Buffett (L), one of his financial advisors, speaks to reporters after a meeting of Schwarzenegger's Economic Recovery Council in Los Angeles August 20, 2003. REUTERS/Fred Prouser FSP
Billionaire financier Warren Buffett looks on after a meeting with U.S. Senator Arlen Specter (R-PA) and chairman of the Senate Judiciary Committee, at the Hart Senate Office Building on Capitol Hill in Washington June 29, 2005. Specter is the co-author of a bill seeking to create a $140 billion asbestos compensation fund. REUTERS/Shaun Heasley SH/TC
Billionaire Warren Buffett arrives at the Sun Valley Resort in Sun Valley, Idaho July 10, 2007. The world's biggest media chiefs gather this week at the 25th annual Allen & Co. conference at the resort starting today. REUTERS/Rick Wilking (UNITED STATES)
Warren Buffett, chairman and CEO of Berkshire Hathaway, speaks at a Senate Finance Committee hearing about "Federal Estate Tax: Uncertainty in Planning Under the Current Law" on Capitol Hill in Washington, November 14, 2007. Billionaire Buffett warned of widening U.S. income disparity and endorsed the estate tax as a check on wealth accumulation, while two senior lawmakers said they want the tax repealed. REUTERS/Jason Reed (UNITED STATES)
Billionaire financier and Berkshire Hathaway Chief Executive Warren Buffett greets shareholders during the Berkshire Hathaway Annual Shareholders meeting in Omaha, Nebraska May 3, 2008. REUTERS/Carlos Barria (UNITED STATES)
Billionaire investor Warren Buffett laughs as he appears with Microsoft Corporation founder Bill Gates for a town hall style meeting with business students broadcast by financial television network CNBC at Columbia University in New York, November 12, 2009. REUTERS/Mike Segar (UNITED STATES BUSINESS)
Berkshire Hathaway Chairman Warren Buffett kisses his ukulele at the Berkshire Hathaway annual meeting in Omaha May 1, 2010. Buffett played "I've Been Working on the Railroad." REUTERS/Rick Wilking (UNITED STATES - Tags: BUSINESS TRANSPORT)
Billionaire financier and Berkshire Hathaway Chief Executive Warren Buffett (L) and Microsoft founder Bill Gates gesture at the national launch ceremony for the BYD M6 vehicle in Beijing September 29, 2010. Chinese battery and car maker BYD, backed by Buffett, launched its first premium multi-purpose vehicle (MPV) in Beijing on Wednesday to tap rising demand in the world's biggest auto market. REUTERS/Jason Lee (CHINA - Tags: TRANSPORT BUSINESS)
Billionaire Warren Buffett, wearing a traditional tikka or a red mark on the forehead, speaks during a news conference in Bangalore March 22, 2011. Buffett on Tuesday said he is looking to invest in large countries like India, China and Brazil, but added that restrictions on foreign ownership in India's insurance industry could be a deterrent. Buffett also said and the U.S. economy was improving and that the devastating earthquake in Japan would not hurt global growth. REUTERS/Stringer (INDIA - Tags: BUSINESS)
Berkshire Hathaway Chairman Warren Buffett tours the floor of the New York Stock Exchange September 30, 2011. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS)
Berkshire Hathaway chairman Warren Buffett holds his hand over his heart during the singing of the national anthem, at the start of a 5km race sponsored by Brooks Sports Inc., a Berkshire-owned company, in Omaha May 5, 2013, a day after the company's annual meeting. Buffett at the meeting on May 4, 2013 gave the most extensive comments to date about the future of Berkshire Hathaway Inc after he is gone, saying he still expects the conglomerate to be a partner of choice for distressed companies. REUTERS/Rick Wilking (UNITED STATES - Tags: BUSINESS SPORT ATHLETICS)
Warren Buffett, Chairman of the Board and CEO of Berkshire Hathaway, poses for a portrait in New York October 22, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: BUSINESS)
Roberta Buffett Elliott sits with her brother Warren Buffett as they attend an announcement ceremony at Northwestern University in Evanston, Illinois, January 28, 2015. The sister of financial investor Warren Buffett has given Northwestern University more than $100 million to create the Roberta Buffett Institute for Global Studies, the largest single gift in the school's 164-year history, the university said on Wednesday. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EDUCATION SOCIETY)
Warren Buffett, chairman and CEO of Berkshire Hathaway, speaks at the Fortune's Most Powerful Women's Summit in Washington October 13, 2015. REUTERS/Kevin Lamarque/File Photo
Warren Buffett, chairman and CEO of Berkshire Hathaway, smiles before speaking with Bill Gates (not pictured), at Columbia University in New York, U.S., January 27, 2017. REUTERS/Shannon Stapleton
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"He's always considered elections important," said Paul Landow, a political science professor at the University of Nebraska, Omaha, who has worked as a U.S. congressional aide, a state party leader and as chief of staff to the city's mayor. "But this year he really wants Hillary to win."

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The appearances, though, still may be the best Clinton can hope for from Buffett, who is an outspoken critic of the unlimited spending in politics that was set in motion by the Supreme Court's 2010 Citizens United decision. Even so, the events in Nebraska, which doesn't hold its Democratic caucus until March, are designed for maximum impact: much of neighboring Iowa, which holds the first caucus in the nation February 1, tunes in to Omaha television.

"The Omaha media market is one third of Iowa," said former Nebraska Senator Bob Kerrey, a Democrat who ran for the party's 1992 nomination against Bill Clinton. "If Warren were living in Sioux Falls, South Dakota, I don't think we'd be having this conversation."

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The events this week in Omaha are the culmination of a long evolution for the billionaire. The son of a Republican U.S. congressman, Buffett started shifting his allegiance to Democrats decades ago. He has become more active as the Republican Party moved further to the right, according to a person familiar with his thinking who asked not to be identified to protect their relationship.

During the 2008 campaign, Buffett appeared as a featured guest at fundraisers for Hillary Clinton and Barack Obama, but declined to endorse either during the primaries and limited his contributions to the legal maximum that could be given directly to candidates. Even after Obama awarded him the Presidential Medal of Freedom and stumped for re-election touting the "Buffett Rule" for middle class taxes, the chairman and chief executive of Berkshire Hathaway Inc. limited his commitment of time and cash.

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Buffett, who didn't respond to a request for comment left with an assistant, has endorsed Clinton's candidacy since 2012, when he said in an interview with CNN that no one would be better qualified to run the country.

"She has a vision for America that's very similar to mine in terms of everybody being included in the prosperity we enjoy," he told Bloomberg earlier this year. "And I think that she would work very, very hard at getting policies implemented that would lead to that."

Yet as Clinton allies brag about his buy-in, some of the billionaire's longtime acquaintances are doubtful he'll have that great an impact.

Richard Holland, one of Buffett's early investors, has been leaning on his friend for years to give more money to Democrats -- with little success. Buffett has been more wrapped up in running his company than becoming a "big wheel" in politics, Holland said.

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Buffett: 'Clinton E-Mails Haven't Been Handled Well'

"A lot of people admire Warren," he said. "I believe that he can influence voting, but I don't know how much."

Former Senator Kerrey said Buffett can be a great confidant to politicians, offering thoughtful advice that sometimes runs contrary to his own economic interests. But campaigns sometimes hype their association with him to attract attention.

"It certainly doesn't hurt" to have Buffett engaged, Kerrey said. "But it's not a game changer."

Buffett was the main draw at an event in New York last week, for which a dozen mostly Wall Street attendees committed $33,400 each to the Hillary Victory Fund, and will join Clinton on Wednesday morning in Omaha for what's being billed as a conversation between the two. Tickets start at $500 and go up to $2,700 for donors who want a photo with both. Those who raise $27,000 or more will have access to a reception with the candidate and billionaire.

At the rally afterward at Omaha's Sokol Auditorium, the duo will talk about their shared view of inequities in the tax code. Clinton has spent the past month highlighting her commitment to avoid tax increases on families earning less than $250,000 a year -- a stance she argues that neither one of her Democratic opponents will take.

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Hillary Clinton through the years
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Buffett takes to the stump as Clinton looks to shore up Iowa
A 1992 photo shows then Governor of Arkansas Bill Clinton (L) and his wife Hillary (R) embracing. (Photo credit AFP/Getty Images)
Democratic presidential candidate Bill Clinton (L) waves to supporters as he holds the hand of his wife Hillary, 22 July, 1992 after speaking at a rally. St. Louis was the last stop on the Clinton-Gore campaign's bus tour. The crowd was estimated at 40,000. (Photo credit Tim Clary, AFP/Getty Images)
US President Bill Clinton's wife Hillary Rodham Clinton (l) in a picture taken 16 January 1993 in Little Rock, hugs her daughter Chelsea during a farewell address to the people of Arkansas at an airport rally. The Clinton family then left for Charlottesville, Virginia for the start of the planned bus trip to Washington, DC. (Photo credit J. David Ake, AFP/Getty Images)
First Lady Hillary Clinton (R) watches over as 12-year-old Chevon Perry (L) works on a lesson at P.S. 115 Elementary School 26 January 1993. Clinton made her first trip as first lady to New York to receive an award for her service to children. (Photo credit Tim Clary, AFP/Getty Images)
First Lady Hillary Clinton responds to applause, 12 February 1993, in Arlington, VA, as U.S. President Bill Clinton stands behind her. (Photo credit Robert Giroux, AFP/Getty Images)
U.S. First Lady Hillary Rodham Clinton laughs as she is presented a bouquet of flowers by Japanee children 08 July 1993 at the Meguro waste incineration plant in Tokyo, Japan. Mrs. Clinton, maintaining a high profile during the G7 summit, is popular in Japan. (Photo credit David Nelson, AFP/Getty Images)
U.S. President Bill Clinton (R) and First Lady Hillary Rodham Clinton (L) listen to Karl Kregor explain, 16 September 1993 in Washington, D.C. why he is afraid of losng health isurance for his family.The Clintons met at the White House with citizens who shared problems they have had with the present health care system. Clinton is scheduled to present his health care plan to a joint session of congress 22 September. (Photo credit Paul Richards, AFP/Getty Images)
U.S. First Lady Hillary Clinton responds 22 September 1993 to applause from a joint session of the U.S. Congress in Washington, D.C. after President Bill Clinton saluted her as the 'talented navigator' for the national health plan he is proposing. Standing alongside the first lady is Dr. T. Berry Brazelton (L), a noted pediatrician and author. (Photo credit J. David Ake, AFP/Getty Images)
First Lady Hillary Clinton attends the Winter Olympics in Lillehammer, Norway. (Photo by Clive Brunskill, Getty Images)
US First Lady Hillary Clinton (L) and Wife of French Prime Minister Edouard Balladur, Marie-Josephe Balladur pose at the Hotel Matignon on June 7, 1994. (Photo credit Pascal Pavani, AFP/Getty Images)
First Lady Hillary Rodham Clinton (C) smiles at a friend in the crowd 28 September 1994 as she stands next to Russian First Lady Naina Yeltsin (L) during a ceremony at the Library of Congress. Mrs. Yeltsin was accompanying her husband on his visit to Washington for a summit meeting with US President Bill Clinton. AFP YEARENDER (Photo credit Joshua Roberts, AFP/Getty Images)
US President Bill Clinton (R) and First Lady Hillary Clinton leave the White House for the presidential retreat at Camp David, Maryland, 13 Janaury. President Clinton is waving a copy of the morning pool report on his activities, which was written as a poem. The poem begins ' The president jogged at Fort McNair....of him we saw not hide nor hair,' and ends with the slogan 'Burma Shave.' (Photo credit Paul Richards, AFP/Getty Images)
US First Lady Hillary Clinton laughs as she listens to political humorist Bill Maher address the annual dinner of the Radio and Television Correspondents Association in Washington on March 14, 1995. (Photo credit Paul J. Richards, AFP/Getty Images)
US First Lady Hillary Clinton (L) poses with 'Robo Crook'(R) a character from the television program Sesame Street at the White House in Washington, DC 26 June. Mrs. Clinton moderated a panel discussion on the role of Public Television in educating children. (Photo credit Jamal Wilson, AFP/Getty Images)
Hillary Clinton, wife of US President Bill Clinton, talks with Britain's Queen Elizabeth 30 November in the Grand Entrance Hall of Buckingham Palace in London. President Clinton and Hillary Clinton arrived 29 November morning for a three-day visit which will be dominated by the Northern Ireland peace process. (Photo credit John Stillwell, AFP/Getty Images)
US First Lady Hillary Clinton greets guests after speaking at the Women's Leadership Forum at the World Trade Center 20 June in Boston, Massachusetts.The First Lady will be in Washington DC later 20 June for the arrival of the Olympic Torch at the White House. (Photo credit John Mottern, AFP/Getty Images)
US First Lady Hillary Rodham Clinton waves from the bullet-proof presidential limousine as she and US President Bill Clinton leave Sydney International Airport on November 19, 1996. The Clintons arrived in Australia from Hawaii at the start of a five-day working and holiday visit. A(Photo credit should read Torsten Blackwood, AFP/Getty Images)
US President Bill Clinton (L)and his wife Hillary listen to speakers at a coalition for America's Children event at the White House in Washington, on March 3, 1997. The Clintons will begin a series of television, radio and newspaper public service annoucements, urging Americans to help improve the lives of children. (Photo credit Joyce Naltchayan, AFP/Getty Images)
Hillary Clinton proudly shows the tea-pot which had been a gift from community worker Joyce McCartan on the Clintons' previous visit to Belfast, during her speech at the University of Ulster, in Belfast 31 October. The memorial speech, named after Joyce McCartan, who died last year, called on parties from both sides to make compromises for peace in the country. The American First Lady is on a whistle-stop tour visiting Dublin, Belfast and London in three days. (Photo credit Alan Lewis, AFP/Getty Images)
US First Lady Hillary Clinton talks with NBC TV anchorwoman Katie Couric (L)10 September during an event in the East Room of the White House promoting colon cancer awareness and prevention. Hillary Clinton announced a new research grant to fight colon cancer and unveiled a new public service announcement to promote prevention. (Photo credit Tim Sloan, AFP/Getty Images)
US President Bill Clinton, First Lady Hillary Clinton, and their daughter Chelsea tour the Forbidden City in Beijing, as a Chinese security agent (rear) looks on 28 June during their 9 day official trip to China. The three later toured the Great Wall. (Photo credit Paul J. Richards, AFP/Getty Images)
US First Lady Hillary Rodham Clinton listens to speakers during ceremonies 11 January to unveil the new Dolley Madison commemorative silver dollar coin at the White House in Washington, DC. The coin, designed by Tiffany and Company is available at the US Mint and celebrates the life, achievements and 150th anniversary of Dolley Madison's death. (Photo credit Tim Sloan, AFP/Getty Images)
First Lady Hillary Clinton works the crowd as she arrives at Prior Aviation Services in Buffalo, New York, 07 February, 2000. Mrs. Clinton, who officially announced her run for US Senate 06 February, 2000, made Buffalo her fisrt campaign stop. ((Photo credit Don Emmert, AFP/Getty Images)
US First Lady Hillary Rodham Clinton (R) announces the formation of the Millenium Trails Celebration Committee 19 April, 1999 at the Central Park Boathouse in New York, New York. Millenium Trails is a national initiative to create and enhance hiking, cultural and other trails across the country. It partners the White House Millenium Council, the Department of Transportation and the Rails-to-Trails Conservancy. (Photo credit Stan Honda, AFP/Getty Images)
US President Bill Clinton (L) and First Lady Hillary Rodham Clinton (R) wait on the South Portico for the arrival of King Juan Carlos I and Queen Sofia 23 February 2000 at the White House in Washington, DC. The Clintons hosted an arrival ceremony for their visit. (Photo credit Stephen Jaffe, AFP/Getty Images)
US First Lady and New York US Senate candidate Hillary Clinton waves to the crowd as she arrives on the stage at the Democratic National Convention 14 August 2000 at the Staples Center in Los Angeles, California. (Photo credit Paul J. Richards, AFP/Getty Images)
U.S. Senate candidate and First Lady Hillary Rodham Clinton gives a thumbs-up sign to supporters at the Hispanic Day Parade October 8, 2000 in New York City. (Photo by Chris Hondros/Newsmakers via Getty)
US First Lady Hillary Clinton smiles during a press conference in New York 08 November, 2000. Clinton defeated Congressman Rick Lazio to win the US Senate seat for New York being vacated by Patrick Moynihan. AFP PHOTO Doug KANTER (Photo credit Doug Kanter, AFP/Getty Images)
U.S. Senator-elect, First Lady Hillary Clinton walks through the U.S. Capitol during an orientation day for new senators December 5, 2000 in Washington, DC. (Photo by Mark Wilson/Newsmakers via Getty)
Senator Hillary Rodham Clinton listens during Labor Secretary-designate Elaine Chao's confirmation hearing January 24, 2001 on Capitol Hill in Washington, DC. (Photo by Alex Wong/Newsmakers via Getty)
Sen. Hillary Rodham Clinton (D-NY) attends a press conference to address the equal pay act June 12, 2001 Capitol Hill in Washington, DC. The AFL-CIO''s Working Women Working Together held a news conference to introduce a campaign for legislation to step up enforcement of the 1963 Equal Pay Act. (Photo by Alex Wong/Getty Images)
New York Senator and former First Lady, Hillary Rodham Clinton, signs copies of her autobiography, 'Living History' at Waterstone?s bookstore on July 3, 2003 in London, England. In her autobiography, Clinton reveals her presidential ambitions and her thoughts on Monica Lewinsky. (Photo by Scott Barbour/Getty Images)
Senator Hillary Rodham Clinton appears with Jon Stewart during 'The Daily Show With Jon Stewart' at the Daily Show Studios October 8, 2003 in New York City. (Photo by Scott Gries/Getty Images for The Daily Show)
Sen. Hillary Rodham Clinton (D-NY) attends a news conference in front of the United Nations to denounce the International Court of Justice's recent decision on Israel's security fence July 9, 2004 in New York City. The International Court in The Hague has ruled that the barrier Israel has nearly completed in the West Bank violates international law, and the court ruled that the United Nations should take action to stop its construction. (Photo by Spencer Platt/Getty Images)
U.S. Senator Hillary Rodham Clinton (D-NY) speaks while former U.S. President Bill Clinton listens during a visit to the New York Buddhist Vihara December 31, 2004 in the Queens borough of New York City. The Clintons toured the temple where volunteers have been collecting donations for victims of the tsunami in Sri Lanka. (Photo by Stephen Chernin/Getty Images)
Sen. Hillary Rodham Clinton (D-NY) speaks at a Democratic forum on Social Security reform at Pace University March 4, 2005 in New York City. A group of Democratic Senators spoke at the forum to protest U.S. President George W. Bush's plan to privatize Social Security. (Photo by Mario Tama/Getty Images)
U.S. Senator Hillary Clinton (D-NY) stands near her portrait during an unveiling ceremony at the Smithsonian April 24, 2006 in Washington DC. President Clinton's portrait will hang in the National Portrait Gallery's 'America's President's' exhibit. (Photo by Mark Wilson/Getty Images)
Hillary Rodham Clinton watches a speaker on the final day of the Clinton Global Initiative annual meeting September 22, 2006 in New York City. A large array of notables in the worlds of politics, human rights, and philanthropy have gathered in the New York for three days of seminars and pledges on global issues. (Photo by Chris Hondros/Getty Images)
Democratic presidential hopeful Sen. Hillary Clinton (D-NY) speaks during a post primary rally at Southern New Hampshire University January 8, 2007 in Manchester, New Hampshire. After losing to Sen. Barack Obama (D-IL) and Edwards in Iowa, Clinton (D-NY) won New Hampshire, the first of the nation's presidential primaries. (Photo by Chris Hondros/Getty Images)
US Senator Hillary Clinton and daughter Chelsea are seen at the lectern during a soundcheck at the Democratic National Convention 2008 at the Pepsi Center in Denver, Colorado, on August 26, 2008. Clinton takes the stage tonight vowing to unite Democrats after her primary battle with Barack Obama, on the second day of the convention that will crown him as White House nominee. The DNC is held 25-28 August. (Photo credit Stan Honda, AFP/Getty Images)
Democratic presidential nominee U.S. Sen. Barack Obama (D-IL) and Sen. Hillary Clinton (D-NY) attend a campaign rally together at Amway Arena October 20, 2008 in Orlando, Florida. Obama continues to campaign against his challenger, Republican presidential nominee Sen. John McCain (R-AZ) while Election Day begins to draw near. (Photo by Joe Raedle/Getty Images)
Former US President Bill Clinton (L) and US Secretary of State-designate Hillary Clinton (R) attend the inauguration of US President Barack Obama at the US Capitol in Washington, DC, on January 20, 2009. (Photo credit Robyn Beck, AFP/Getty Images)
U.S. Secretary of State Hillary Clinton (L) is sworn in as her husband former President Bill Clinton (2nd L), and her daughter Chelsea (R) look on during a ceremonial swearing-in at the State Department February 2, 2009 in Washington, DC. Clinton is the 67th Secretary of State of the United States of America. (Photo by Alex Wong/Getty Images)
US Secretary of State Hillary Clinton attends a press conference on February 21, 2009 in Beijing, China. Clinton is on a three day visit to the Chinese capital, as part of her first diplomatic tour to Asia. (Photo by Guang Niu/Pool/Getty Images)
US Secretary of State Hillary Clinton speaks on the US vision for Asia-Pacific multilateral engagement at the East-West Center in Honolulu January 12, 2010. (Photo credit Mandel Ngan, AFP/Getty Images)
US Secretary of State Hillary Clinton, smiles during a press conference after Middle East Quartet talks in Moscow on March 19, 2010. The International Quartet on the Middle East urged Israel to freeze all settlement activity and expressed deep concern about the situation in Gaza, UN Secretary General Ban Ki-moon said. (Photo credit Yuri Kadobnov, AFP/Getty Images)
US Secretary of State Hillary Clinton speaks before signing the US-China Consultation on People-to-People Exchange agreement at the National Center for the Performing Arts in Beijing on May 25, 2010. The United States and China were wrapping up strategic talks aimed at smoothing out differences on currency and trade issues, as Washington presses Beijing to get tough on North Korea. (Photo credit Saul Loeb, AFP/Getty Images)
U.S. Secretary of State Hillary Clinton listens to Ambassador-Designate to Russia Michael McFaul during his swearing-in ceremony at the State Department January 10, 2011 in Washington, DC. McFaul is President Barack Obama's top adviser on Russia and has been involved in the reset of relations between the two countries and the signing of the New START treaty. (Photo by Astrid Riecken/Getty Images)
U.S. Secretary of State Hillary Clinton speaks during the South Sudan International Engagement Conference December 14, 2011 at the Marriott Wardman Park Hotel in Washington, DC. The two-day conference was to highlight the national development vision of South Sudan and the opportunities for investment in the country. (Photo by Alex Wong/Getty Images)
US Secretary Hillary Clinton speaks to reporters during a joint press conference with Qatar's Prime Minister and Foreign Minister Hamad bin Jassim bin Jabr Al-Thani at the Department of State January 11, 2012 in Washington, DC. (Photo credit Karen Bleier, AFP/Getty Images)
US Secretary of State Hillary Clinton (R) shakes hands with Moroccan Foreign Minister Saad-Eddine el-Othmani prior to meetings at the State Department in Washington, DC, on March 15, 2012. (Photo credit Saul Loeb, AFP/Getty Images)
US Secretary of State Hillary Clinton smiles during a joint press conference with Australian Foreign Minister arr following their meeting at the State Department in Washington, DC, on April 24, 2012. (Photo credit Jewel Samad, AFP/Getty Images)
U.S. Secretary of State Hillary Clinton testifies before the House Foreign Affairs Committee on Capitol Hill January 23, 2013 in Washington, DC. Lawmakers questioned Clinton about the security failures during the September 11 attacks against the U.S. mission in Benghazi, Libya, that led to the death of four Americans, including U.S. Ambassador Christopher Stevens. (Photo by Chip Somodevilla/Getty Images)
Former US Secretary of State Hillary Clinton addresses the Vital Voices Global Awards ceremony at the Kennedy Center in Washington on April 2, 2013. The event honors 'women leaders from around the world who are the unsung heroines to strengthen democracy, increase economic opportunity, and protect human rights,' according to the group's website. (Photo credit Nicholas Kamm, AFP/Getty Images)
Former US Secretary of State Hillary Clinton speaks about the situation in Syria after meeting with US President Barack Obama, prior to remarks about US efforts to combat wildlife trafficking at a White House forum at the Eisenhower Executive Office Building in Washington, DC on September 9, 2013. (Photo credit Saul Loeb, AFP/Getty Images)
Former Secretary of State Hillary Rodham Clinton speaks on stage at the Pennsylvania Conference For Women 2013 at Philadelphia Convention Center on November 1, 2013 in Philadelphia, Pennsylvania. (Photo by Lisa Lake/Getty Images for Pennsylvania Conference for Women)
Hillary Clinton attends the New-York Historical Society 2014 History Makers Gala at Mandarin Oriental Hotel on November 21, 2014 in New York City. (Photo by Brad Barket/Getty Images)
Hillary Rodham Clinton Book Signing For 'Hard Choices' at Barnes & Noble bookstore at The Grove on June 19, 2014 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
Former U.S. Secretary of State Hillary Clinton delivers a keynote address during the Watermark Silicon Valley Conference for Women on February 24, 2015 in Santa Clara, California. Former Secretary of State Hillary Clinton delivered a keynote address to thousands of women in attendance for the Watermark Silicon Valley Conference for Women. (Photo by Justin Sullivan/Getty Images)
Former Secretary of State Hillary Clinton speaks on stage during a ceremony to induct her into the Irish America Hall of Fame on March 16, 2015 in New York City. The Irish America Hall of Fame was founded in 2010 and recognizes exceptional figures in the Irish American community. (Photo by Yana Paskova/Getty Images)
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While Clinton and Buffett see eye-to-eye on taxes for individuals, some of his business moves appear to have been at odds with her policy positions. Last week, she rolled out her plans aimed at stopping inversions and other maneuvers that cut corporate tax rates by shifting profits overseas. Berkshire invested $3 billion in Burger King's 2014 buyout of Canada's Tim Hortons. The move, which Buffett said wasn't about the tax advantage, drew criticism from lawmakers including U.S. Senator Elizabeth Warren.

Buffett may never be the Democrats' antidote to Republican mega-donors Charles and David Koch or Sheldon Adelson, but his political contributions have ratcheted up as he's become more engaged. In the 2012 election cycle, he gave almost $200,000 to campaigns and party committees, according to federal and state records. Two years later, he cut a $100,000 check to Democrat Chuck Hassebrook's unsuccessful bid for Nebraska governor. (The state doesn't have contribution limits.) That was followed by a $25,000 donation to a political action committee that helped lay the groundwork for Clinton's current run. He also contributed the $2,700 maximum to her primary campaign in April.

"I support her," he said on CNN that month. "I would not write a huge check. I would go out and raise money for her. I'd be delighted to do that. I would hope to do it. I did some of that in 2008. I just don't believe that the election should be decided by the super rich."

Read Buffett Takes to the Stump as Clinton Looks to Shore Up Iowa on bloombergpolitics.com

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