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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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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Rep. Ron Paul. Patrick Smith/Getty Images hide caption

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Republican presidential candidate former Massachusetts Gov. Mitt Romney, right, makes a point as Texas Gov. Rick Perry listens, during a debate in Orlando, Fla. Phelan M. Ebenhack/AP hide caption

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