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Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters at the end of his Super Tuesday campaign rally in Boston, Tuesday, March 6, 2012. (AP Photo/Stephan Savoia)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters at the end of his Super Tuesday campaign rally in Boston, Tuesday, March 6, 2012. (AP Photo/Stephan Savoia)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters at the end of his Super Tuesday campaign rally in Boston, Tuesday, March 6, 2012. (AP Photo/Stephan Savoia)
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