In a race with more than 20 candidates running just for the Republican and Democratic nominations, not everyone can muster up enough support to make it onto the main debate stage. But those candidates still have interesting backgrounds and noteworthy issues they hope to champion.
Here's a quick look at some of the other candidates trying to win their way to the White House in 2016.
Jim Gilmore: Running for the Republican party nomination
Gilmore, who served as governor of Virginia from 1998 to 2002, has struggled the most to find supporters in the crowded GOP field -- and didn't manage to make the CNN debate.
John McAfee: Running for the nomination of his own 'Cyber Party'
A former tech exec famous for his security software with a checkered legal past, McAfee promises to avoid the campaign trail and run on a platform of "Privacy, Freedom and Technology."
Jim Webb: Dropped out in September after pursuing theDemocratic party nomination
Rick Perry: Dropped out in September after pursuing the Republican party nomination
Lincoln Chafee: Dropped out in October after pursuing the Democratic party nomination
Lawrence Lessig: Dropped out in November after pursuing the Democratic party nomination
Bobby Jindal: Dropped out in November after pursuing the Republican party nomination.
Lindsey Graham: Dropped out in December after pursuing the Republican party nomination
Martin O'Malley: Dropped out in February after losing the Iowa caucus
George Pataki: Dropped out in December after pursuing the Republican party nomination
Rick Santorum: Dropped out in February after a poor showing in the Iowa caucuses
Mike Huckabee: Dropped out in February after a poor showing in the Iowa caucuses
More on the candidates:
2016: The 'other' candidates
Other candidates: 2016 candidate profiles
Lincoln Chafee, former governor of Rhode Island and 2016 Democratic presidential candidate, speaks during the Democratic Wing Ding in Clear Lake, Iowa, U.S., on Friday, Aug. 14, 2015. The event, first held in 2004, raises funds for county Democratic Central Committees. Photographer: Daniel Acker/Bloomberg via Getty Images
DES MOINES, IA - JANUARY 24: Former Virginia Gov. Jim Gilmore speaks to guests at the Iowa Freedom Summit on January 24, 2015 in Des Moines, Iowa. The summit is hosting a group of potential 2016 Republican presidential candidates to discuss core conservative principles ahead of the January 2016 Iowa Caucuses. (Photo by Scott Olson/Getty Images)
NEW YORK, NY - SEPTEMBER 01: U.S. Sen. Lindsey Graham (R-SC) speaks at a 'Stop Iran Rally,' regarding the Iran nuclear deal on September 1, 2015 in New York City. Graham is one of 16 Republican hopefuls running for the Republican presidential nomination. Congress has until September 16 to either officially support or denounce the deal. (Photo by Andrew Burton/Getty Images)
Bobby Jindal, governor of Louisiana and 2016 Republican presidential candidate, speaks to the media in the spin area after a televised forum ahead of the first Republican presidential debate at Quicken Loans Arena in Cleveland, Ohio, U.S., on Thursday, Aug. 6, 2015. Seven candidates in the forum, hosted by Fox News and Facebook Inc. in conjunction with the Ohio Republican Party, were omitted from the prime-time debate stage after they didn't make the top 10 of an average of the five most recent national polls as recognized by Fox News. Photographer: Andrew Harrer/Bloomberg via Getty Images
AUSTIN, TX - MARCH 14: Lawrence Lessig, director of the Edmond J. Safra Center for Ethics at Harvard University, speaks onstage at 'MAYDAY: The Fight To Save American Democracy' during the 2015 SXSW Music, Film + Interactive Festival at Hilton Austin on March 14, 2015 in Austin, Texas. (Photo by Sandra Dahdah/Getty Images for SXSW)
John McAfee speaks during an interview in Miami, Florida, U.S., on Friday, Dec. 14, 2012. McAfee, who is wanted for questioning in the shooting of an American citizen in Belize, was denied asylum by Guatemala. Photographer: Louis Lanzano/Bloomberg via Getty Images
NEW YORK, NY - SEPTEMBER 14: Democratic presidential candidate and former Maryland Governor Martin O'Malley meets with gun safety advocates on September 14, 2015 in New York City. O'Malley's campaign has struggled to gain national attention in comparison to fellow Democratic candidates Hillary Clinton and Bernie Sanders. (Photo by Andrew Burton/Getty Images)
CLEVELAND, OH - AUGUST 05: Republican presidential candidate George Pataki is interviewed by Sirius XM Patriot host David Webb during the Republican National Committee Summer Meeting at the Renaissance Hotel August 5, 2015 in Cleveland, Ohio. The former governor of New York, Pataki is in Cleveland ahead of Thursday's GOP presidential debate, the first of the 2016 election cycle. (Photo by Chip Somodevilla/Getty Images)
ST. LOUIS, MO - SEPTEMBER 11: Republican Presidential Nominee Governor Rick Perry (R-TX) speaks to the crowd during the Eagle Forum's Eagle Council Event at the Marriott St. Louis Airport Hotel on September 11, 2015 in St. Louis, Missouri. A number of Republican Presidential Nominees will address the crowd to express their views on the status of America. (Photo: Michael B. Thomas/Getty Images)
UNITED STATES - AUGUST 20: GOP Presidential candidate and former Sen. Rick Santorum, R-Pa., delivers a speech on his immigration policy at the National Press Club in Washington on Thursday, Aug. 20, 2015. (Photo By Bill Clark/CQ Roll Call)
Jim Webb, former Senator from Virginia and 2016 Democratic presidential candidate, speaks to attendees at the Iowa State Fair Soapbox in Des Moines, Iowa, U.S., on Thursday, Aug. 13, 2015. The Iowa State Fair is expected to host 18 presidential candidates and runs until Aug. 23. Photographer: Andrew Harrer/Bloomberg via Getty Images