Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at NuVasive, Inc., a medical device company, Monday, March 26, 2012, in San Diego, Calif. (AP Photo/Steven Senne)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at NuVasive, Inc., a medical device company, Monday, March 26, 2012, in San Diego, Calif. (AP Photo/Steven Senne)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at NuVasive, Inc., a medical device company, Monday, March 26, 2012, in San Diego, Calif. (AP Photo/Steven Senne)
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