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Former Massachusetts Gov. Mitt Romney (right) and former Pennsylvania Sen. Rick Santorum argue a point Feb. 22, 2012, during a Republican presidential debate in Mesa, Ariz. (Associated Press)
Photo by: Jae C. Hong
Former Massachusetts Gov. Mitt Romney (right) and former Pennsylvania Sen. Rick Santorum argue a point Feb. 22, 2012, during a Republican presidential debate in Mesa, Ariz. (Associated Press)

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