September 8, 2011
Republican presidential candidates former Massachusetts Gov. Mitt Romney, left, and Texas Gov. Rick Perry answer a question during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif.
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Quick to tangle, Republican presidential rivals Rick Perry and Mitt Romney sparred vigorously over job creation and Social Security Wednesday night in a feisty campaign debate that marked a contentious new turn in the race to pick a 2012 challenger to President Barack Obama. INCLUDES VIDEO.