Republican presidential candidate Donald Trump speaks during a primary night news conference Tuesday in New York City. Julie Jacobson/AP hide caption
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John Kasich
Thursday
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
Monday
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
Wednesday
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
Thursday
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
Tuesday
Republican presidential candidate Ted Cruz addressed the Brussels attacks on Tuesday morning in Washington, D.C. Win McNamee/Getty Images hide caption
Tuesday
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
Friday
Donald Trump reacts during a campaign rally in Fayetteville, N.C., Wednesday. Gerry Broome/AP hide caption
Tuesday
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
Friday
Marco Rubio and Donald Trump participate in the Republican presidential debate in Detroit. Geoff Robins/AFP/Getty Images hide caption
Thursday
Donald Trump gestures Thursday as Sen. Marco Rubio, R-Fla., listens to Trump's response during a Republican presidential primary debate in Detroit. Paul Sancya/AP hide caption