Republican presidential candidate, former Massachusetts Gov. Mitt Romney shakes hands during a campaign stop at William Jewell College on Tuesday, March 13, 2012, in Liberty, Mo. (AP Photo/Evan Vucci)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney shakes hands during a campaign stop at William Jewell College on Tuesday, March 13, 2012, in Liberty, Mo.  (AP Photo/Evan Vucci)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney shakes hands during a campaign stop at William Jewell College on Tuesday, March 13, 2012, in Liberty, Mo. (AP Photo/Evan Vucci)
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