President Trump's approval rating is slipping, and it's largely because of cracks among his base. Brendan Smialowski/AFP/Getty Images hide caption
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Sen. Bernie Sanders of Vermont speaks to the press in November. Sanders hasn't officially decided on another presidential run — yet. Zach Gibson/Getty Images hide caption
The 2020 election cycle might have already started. The Federal Election Commission shows that 129 people have filed to run for president in the next election. Annette Elizabeth Allen for NPR hide caption
Ohio Gov. John Kasich, shown at a White House event in November, met with GOP members of the Senate Finance Committee last week for a closed-door discussion about the health care law. Cheriss May/NurPhoto via Getty Images hide caption
Meet The Republican Governors Who Don't Want To Repeal All Of Obamacare
Republican presidential candidate Donald Trump speaks during a campaign rally at The Fox Theatre this week in Atlanta. Branden Camp/Getty Images hide caption
Donald Trump speaks during a campaign stop in Carmel, Ind., on Monday. Joe Raedle/Getty Images hide caption
Ted Cruz announced that he is dropping out of the presidential race. Ariel Zambelich/NPR hide caption
Democratic presidential candidate Hillary Clinton takes selfies with supporters at a campaign stop in Indianapolis on Sunday. Paul Sancya/AP hide caption
While campaigning in Indiana, Texas Sen. Ted Cruz came face to face with a protester who supports his rival Donald Trump. LesGrossman2015/YouTube hide caption
Vice President Hubert Humphrey (right) and his running mate, Sen. Edmund S. Muskie, wave to the crowd with their wives at the Democratic Convention in Chicago on Aug. 29, 1968. Violence ensued inside and outside the convention hall. AP hide caption
Republican presidential candidate Donald Trump speaks during a primary night news conference Tuesday in New York City. Julie Jacobson/AP hide caption
Republican presidential candidate Donald Trump speaks at a campaign rally Monday in Wilkes-Barre, Pa. Trump won Tuesday's primary race in the state Mel Evans/AP hide caption
Republican presidential candidate Donald Trump speaks during a campaign rally in Hagerstown, Md., on Sunday. Manuel Balce Ceneta/AP hide caption
Republican presidential candidates Ted Cruz and John Kasich shake hands at the start of a CNN debate in Coral Gables, Fla., in March. Wilfredo Lee/AP hide caption
In a Republican race marked by anger and anti-establishment fervor, Kasich is running the optimistic campaign. Is that enough to win? Andrew Burton/Getty Images hide caption
Balloons fall at the 2012 Republican National Convention in Tampa, Fla. This year's convention in Cleveland is likely to be far more complicated. Charles Dharapak/AP hide caption
Can A Candidate Pay Delegates? Plus, 3 Possible GOP Convention Scenarios
Donald Trump takes part in a CNN town hall event in Milwaukee on Tuesday. Darren Hauck/Getty Images hide caption
Why Donald Trump Reversed His Pledge To Support The GOP Nominee
Clockwise from top left: Hillary Clinton, Donald Trump, John Kasich, Ted Cruz and Bernie Sander Justin Sullivan; Andrew Harrer; Ralph Freso; Bob Levey; Brendan Smialowski/Getty Images hide caption
Listen: Hillary Responds To Critics Allegations
A polling station in Oakmont, Pa., on Nov. 6, 2012. Winning a presidential nomination includes mastering complex rules about delegates, and Pennsylvania's rules are among the most complicated. Jeff Swensen/Getty Images hide caption
In This GOP Primary, You Can Win The State But Get Only A Few Delegates
Republican presidential candidate Ted Cruz addressed the Brussels attacks on Tuesday morning in Washington, D.C. Win McNamee/Getty Images hide caption
Bernie Sanders and Hillary Clinton stand together Wednesday before the start of the Democratic presidential debate at Miami Dade College in Miami. Wilfredo Lee/AP hide caption
Donald Trump reacts during a campaign rally in Fayetteville, N.C., Wednesday. Gerry Broome/AP hide caption
Bernie Sanders addresses a rally at Macomb Community College in Warren, Mich. Sanders needs a good showing in Michigan on Tuesday to start to turn his campaign around. Scott Olson/Getty Images hide caption
Marco Rubio and Donald Trump participate in the Republican presidential debate in Detroit. Geoff Robins/AFP/Getty Images hide caption