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GOP debate in Mesa, Ariz.

ElectionsPoliticsRon PaulNewt GingrichRick SantorumMitt RomneyRepublican Party
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 during a Republican presidential debate in Mesa, Ariz. Jae C. Hong / Associated Press
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