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Supporters of Democratic presidential candidate Sen. Bernie Sanders cheer and hold up signs, including one of Sanders, during a campaign rally at Colorado State University Sunday. Jacquelyn Martin/AP hide caption

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Jacquelyn Martin/AP

Walter Mondale, the 1984 Democratic presidential nominee, pumps his fist during his acceptance speech at the Democratic National Convention in San Francisco. Anonymous/AP hide caption

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Anonymous/AP

Donald Trump greets supporters after speaking at a caucus night watch party at the Treasure Island Hotel & Casino in Las Vegas. Trump is favored to do well Super Tuesday. Ethan Miller/Getty Images hide caption

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Ethan Miller/Getty Images

A voter marks a ballot during the New Hampshire primary. So far just a small percentage of votes have been cast. But that changes after Super Tuesday. David Goldman/AP hide caption

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David Goldman/AP

NPR's Politics Podcast Explains Super Tuesday

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Activists with People For the American Way demonstrate outside the Supreme Court on Monday, calling on Congress to give consideration to whomever President Obama nominates to replace Antonin Scalia. Bill Clark/CQ Roll Call/Getty Images hide caption

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Bill Clark/CQ Roll Call/Getty Images

Democratic presidential candidate Hillary Clinton speaks at her first-in-the-nation presidential primary campaign rally on Tuesday in Hooksett, N.H. Matt Rourke/AP hide caption

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Matt Rourke/AP

Bernie Sanders and Donald Trump deliver victory speeches at their respective watch parties in New Hampshire. Jewel Samad/AFP; Joe Raedle/Getty Images hide caption

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Jewel Samad/AFP; Joe Raedle/Getty Images