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Remaining GOP presidential hopefuls Rick Santorum, Mitt Romney, Ron Paul and Newt Gingrich sparred at a Republican Presidential Debate at the Mesa Arts Center in Mesa, Arizona on Feb. 22, 2012.
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Mitt Romney waves to the crowd as he enters the stage for the Republican Presidential Debate at the Mesa Arts Center in Mesa, Arizona, February 22, 2012. UPI /Art Foxall
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