President Obama greets patrons at Ross' Restaurant in Bettendorf, Iowa, on Tuesday. In 2008, the president's unexpected victory in the state helped propel his campaign. Saul Loeb/AFP/Getty Images hide caption

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In Political Summer, Have Iowans Cooled To Obama?

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GOP Primary Voters Explore Bachmann's Campaign

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Bachmann Kicks Off Her Presidential Campaign

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U.S. Rep. Michele Bachmann greets Irene Blom before speaking at a Presidential Lecture Series sponsored by The Family Leader, April 11, 2011 in Pella, Iowa. Bachmann, along with Herman Cain, Newt Gingrich, Gary Johnson and Rick Santorum, are expected to drop in on a Tea Party Bus Tour making its way through Iowa. Charlie Neibergall/AP hide caption

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Tea Party Revs Up Bus Tour, Rolls Through Iowa

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Then-Democratic presidential hopeful Barack Obama waves during a May 24, 2008, campaign stop in San Juan, Puerto Rico. Keeping a campaign promise, Obama returns Tuesday. Brennan Linsley/AP hide caption

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Obama Wants Puerto Rico Trip To Send A Message

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Gingrich Campaign Regroups After Senior Team Quits

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Republican presidential hopeful, former Mass. Gov. Mitt Romney meets with entrepreneurs at Bizdom U in Detroit on Thursday. Bizdom U is a business development center to help entrepreneurs start up businesses in the state. Carlos Osorio /AP hide caption

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Covering Kevorkian, From The First Suicides On

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Corn is big business in Iowa, which has usually made anything but support for ethanol subsidies off-limits for presidential hopefuls. Steve Pope/AP hide caption

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Who's Afraid Of Ethanol? The 2012 Race Will Tell

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Former Massachusetts Gov. Mitt Romney focuses on a key issue — corn — in Ankeny, Iowa, on Friday, as he prepares to launch his 2012 presidential bid. Charlie Neibergall/AP hide caption

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Romney Back In Iowa, Shadowed by 2008 Loss

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Pawlenty Announces Candidacy For President

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Early In Campaign, Gingrich Faces Controversy

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Potential GOP Candidates Find Their Way To Iowa

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Mitt Romney Takes On Healthcare In Mich. Speech

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Already? GOP Kicks Off Presidential Debates

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