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)
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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