GOP debate in Arizona(10 images)

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.

Mitt Romney sings the National Anthem before the Republican Presidential Debate at the Mesa Arts Center in Mesa, Arizona, February 22, 2012. UPI /Art Foxall | License Photo
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