Former first lady Barbara Bush, mother of Republican presidential candidate Jeb Bush, campaigns with her son at a town hall meeting at West Running Brook Middle School in Derry, N.H. Jacquelyn Martin/AP hide caption

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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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Jerry Dunleavy stands inside his dorm room at "Camp Cruz," on the campus of AIB College of Business in Des Moines. Dunleavy, from Cleveland, quit his job and went to Iowa, leaving everything behind, to campaign for Ted Cruz. Clay Masters/Iowa Public Radio hide caption

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'Camp Cruz': The Surplus Iowa Dorm Filled With Cruz Volunteers
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Former Pennsylvania Sen. Rick Santorum campaigning in Des Moines, Iowa. Andrew Harnik/AP hide caption

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Santorum Struggles To Regain 2012 Momentum
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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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Got Corn? Ethanol Is No Longer King In Iowa Among Candidates
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Wisconsin Gov. Scott Walker speaks at a news conference Monday in Madison, Wis., where he announced that he is suspending his Republican presidential campaign. Morry Gash/AP hide caption

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Ex-Iowa State Sen. Kent Sorenson defected from Michele Bachmann's campaign before the 2012 Iowa caucuses. In a 2014 plea deal, he admitted that he lied about payments from the Ron Paul campaign. Charles Dharapak/AP hide caption

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Big Money And Backstabbing Have Become Part Of The Iowa Game
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Republican presidential candidate and Wisconsin Gov. Scott Walker speaks at the Iowa State Fair, where he encountered protesters over his record in Wisconsin. Charlie Neibergall/AP hide caption

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Democratic presidential candidate Hillary Clinton speaks at the Iowa Democratic Wing Ding at the Surf Ballroom on Friday. Appearing at the Iowa State Fair on Saturday, she said the controversy over her emails was the "usual" politics. Charlie Riedel/AP hide caption

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