President Trump's approval rating is slipping, and it's largely because of cracks among his base. Brendan Smialowski/AFP/Getty Images hide caption
John Kasich
Thursday
Friday
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
Saturday
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
Monday
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
Thursday
Republican presidential candidate Donald Trump speaks during a campaign rally at The Fox Theatre this week in Atlanta. Branden Camp/Getty Images hide caption
Wednesday
Donald Trump speaks during a campaign stop in Carmel, Ind., on Monday. Joe Raedle/Getty Images hide caption
Tuesday
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
Monday
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
Thursday
Republican presidential candidate Donald Trump speaks during a primary night news conference Tuesday in New York City. Julie Jacobson/AP hide caption
Tuesday
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
Monday
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
Tuesday
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