Iowa caucus Iowa caucus

Florida Sen. Marco Rubio may have finished third, but he had a better-than-expected night in Iowa, thanks in part to larger turnout and evangelical voters. Pete Marovich/Getty Images hide caption

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Pete Marovich/Getty Images

Gas stations across Iowa, like this Casey's General Store in Des Moines, boast ethanol as "cleaner air for Iowa." Clay Masters/Iowa Public Radio hide caption

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Clay Masters/Iowa Public Radio

Got Corn? Ethanol Is No Longer King In Iowa Among Candidates

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Caucuses have been plagued by embarrassing problems this election season, but they're an American tradition. Here, a ballot from Nevada precinct 3726 shows a vote for former Speaker of the House Newt Gingrich. David Becker/Getty Images hide caption

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David Becker/Getty Images

Jan White, left, Brenda Robertson, center, and Janet Freixas, right, count paper ballots at the headquarters of the Douglas County Republican Party Saturday in Minden, Nev., following county-wide Nevada caucus meetings. Ted S. Warren/AP hide caption

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Ted S. Warren/AP