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** FILE ** Republican presidential candidates (from left) Rep. Ron Paul of Texas, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich share the stage Feb. 22, 2012, during a GOP presidential debate in Mesa, Ariz. (Associated Press)
Photo by: Jae C. Hong
** FILE ** Republican presidential candidates (from left) Rep. Ron Paul of Texas, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich share the stage Feb. 22, 2012, during a GOP presidential debate in Mesa, Ariz. (Associated Press)

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