Donald Trump speaks at Fountain Park during a campaign rally on March 19, 2016 in Fountain Hills, Ariz. Ralph Freso/Getty Images hide caption

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Young Republicans Ponder Trump's Lasting Impact On The GOP

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Republican presidential candidates, Sen. Marco Rubio, R-Fla., left, Donald Trump, Sen. Ted Cruz, R-Texas, and Ohio Gov. John Kasich, right, stand together during the signing of the National Anthem, before the start of the Republican presidential debate Thursday in Miami. Wilfredo Lee/AP hide caption

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Democratic presidential candidate Sen. Bernie Sanders scored an upset win in Michigan on Tuesday. He's seen here speaking last week in Illinois, which holds its primary next Tuesday. Seth Perlman/AP hide caption

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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

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Marco Rubio and Donald Trump participate in the Republican presidential debate in Detroit. Geoff Robins/AFP/Getty Images hide caption

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Marco Rubio Defends His 'Small Hands' Criticism Of Donald Trump

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Donald Trump addresses a crowd in South Carolina. Trump has the clearest path to the GOP nomination, but Republicans opposed to him aren't giving up the fight. Spencer Platt/Getty Images hide caption

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