Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at a campaign stop in Pittsburgh, Pa., Friday, May 4, 2012. (AP Photo/Jae C. Hong)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at a campaign stop in Pittsburgh, Pa., Friday, May 4, 2012. (AP Photo/Jae C. Hong)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at a campaign stop in Pittsburgh, Pa., Friday, May 4, 2012. (AP Photo/Jae C. Hong)
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