Democratic National Committee Head On Debate Schedule, Sanders' Success

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Donald Trump (right) brings the two most recent Iowa winners, Mike Huckabee (left) and Rick Santorum, on stage during Trump's rally for veterans, an event he held instead of attending the GOP debate. Christopher Furlong/Getty Images hide caption

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Texas Sen. Ted Cruz speaks during the 2015 Iowa Faith & Freedom Coalition presidential forum. He's made religion a central tenet of his campaign for the Republican presidential nomination. Bloomberg/Bloomberg via Getty Images hide caption

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Democratic presidential candidate Hillary Clinton speaks at a rally in Marshalltown, Iowa. Clinton is narrowly ahead of Sanders, but within the margin of error in the final Iowa poll. Andrew Harnik/AP hide caption

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Precinct Chairwoman Judy Wittkop explains the rules during a 2008 Democratic caucus in Le Mars, Iowa. Dave Weaver/AP hide caption

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How Exactly Do The Iowa Caucuses Work?

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Embedded In Des Moines: A 'Times' Reporter's Year Covering The '16 Campaign

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Thanks to the current nomination calendar, U.S. presidential candidates (like Chris Christie, pictured at the 2015 Iowa State Fair) get lots of practice at flipping pork chops. Scott Olson/Getty Images News hide caption

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West Liberty, in Iowa's Muscatine County, was the first majority Hispanic town in the state. These days, 17.2% of Muscatine County's population is Latino. Asma Khalid /NPR hide caption

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Activists Mobilize Iowa's Growing Latino Population Toward Caucuses

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Students from Manchester University visit the caucus exhibit at Iowa's state museum in Des Moines Scott Detrow/NPR hide caption

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Politics 101: A College Class Gets Up Close And Personal With The Iowa Caucuses

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'Caucus: The Musical' Jabs At Political Process

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Iowa caucusgoers deposit their ballots on Jan. 3 at a school in Des Moines. On Thursday, the state GOP said it could not account for all votes from the caucuses. Jewel Samad /Getty Images hide caption

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Republican presidential candidates Rick Santorum (left) and Mitt Romney during a debate in South Carolina on Monday. Charles Dharapa/pool/Getty Images hide caption

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Barb Hansen tallies votes during a GOP caucus in precinct 42 near Smithland, Iowa, on Tuesday, Jan. 3, 2012. Dave Weaver/AP hide caption

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