Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at an "Americans 

Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at an "Americans for Prosperity" campaign event in Troy, Mich., Saturday, Feb. 25, 2012. (AP Photo/Gerald Herbert)
Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at an "Americans for Prosperity" campaign event in Troy, Mich., Saturday, Feb. 25, 2012. (AP Photo/Gerald Herbert)
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