Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in St. Louis, Mo., Tuesday, March 13, 2012. (AP Photo/Evan Vucci)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in St. Louis, Mo., Tuesday, March 13, 2012.  (AP Photo/Evan Vucci)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in St. Louis, Mo., Tuesday, March 13, 2012. (AP Photo/Evan Vucci)
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