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Texas Rep. Ron Paul (right) talks with the his presidential campaign manager, Jesse Benton, backstage at the Republican Party's Iowa straw poll last August. Charles Dharapak/AP hide caption

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Charles Dharapak/AP

Ten states hold GOP nominating contests on March 6. Here a voter heads to a polling station Tuesday morning in Cambridge, Mass., where former Gov. Mitt Romney is expected to win his home state. Emmanuel Dunand /AFP/Getty Images hide caption

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Emmanuel Dunand /AFP/Getty Images

Former Massachusetts Gov. Mitt Romney waves to the crowd as he is introduced at the start of Wednesday night's Republican presidential debate in Mesa, Ariz. Ross D. Franklin/AP hide caption

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Ross D. Franklin/AP

Republican presidential hopeful and former U.S. Sen. Rick Santorum speaks to supporters, flanked by his daughter, Elizabeth (left), and wife, Karen. Whitney Curtis/Getty Images hide caption

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Whitney Curtis/Getty Images

Rep. Michele Bachmann waves to supporters Friday in Sioux City before starting a 99-county bus tour of Iowa. Jeff Haynes/Reuters /Landov hide caption

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Jeff Haynes/Reuters /Landov

In Iowa And Beyond, Republicans In Final Push Before Contests Begin

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Newt Gingrich (right) stood his ground Saturday in the GOP presidential debate in Iowa. Mitt Romney (left) may have made a mistake in offering to wager Texas Gov. Rick Perry $10,000. Kevork Djansezian/Getty Images hide caption

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Kevork Djansezian/Getty Images