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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Bernie Sanders arrives for a press conference with union workers in East Lansing, Michigan, where he discussed the effect of free trade agreements on American workers. Scott Olson/Getty Images hide caption

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Democratic presidential candidate Bernie Sanders speaks during a town hall at the University of South Carolina. Sanders promotes the idea of free college education for all. Evan Vucci/AP hide caption

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Fact-Check: Bernie Sanders Promises Free College. Will It Work?
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Fact-Check: New Hampshire GOP Debate
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New Jersey Gov. Chris Christie took aim at his opponents in Saturday's Republican presidential debate. But how solid is his own record? Joe Raedle/Getty Images hide caption

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Fact-Check: GOP Candidates On Taxes And Downgrades
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Fact Checking The Democratic Debate: Clinton, Sanders Battle Over Wall Street
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Democratic presidential candidate Hillary Clinton speaks during a caucus night rally at Drake University in Des Moines on Monday night. Patrick Semansky/AP hide caption

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Coin-Toss Fact-Check: No, Coin Flips Did Not Win Iowa For Hillary Clinton
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Break It Down: Fact-Checking The Final GOP Debate Before Iowa
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Break It Down: Checking Claims In Sunday's Democratic Debate
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