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GOP debate: Ron Paul, Rick Santorum, Mitt Romney, Newt Gingrich

Ron PaulRepublican PartyMitt RomneyNewt GingrichRick Santorum
Republican presidential candidates Rep. Ron Paul of Texas, left, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich at a debate in Mesa, Ariz. Jae C. Hong / Associated Press
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