In this Dec. 29, 2011 file photo, Mitt Romney speaks during a campaign stop at the Music Man Square in Mason City, Iowa. (AP Photo/Charlie Riedel, File)

Associated Press
In this Dec. 29, 2011 file photo, Mitt Romney speaks during a campaign stop at the Music Man Square in Mason City, Iowa. (AP Photo/Charlie Riedel, File)
In this Dec. 29, 2011 file photo, Mitt Romney speaks during a campaign stop at the Music Man Square in Mason City, Iowa. (AP Photo/Charlie Riedel, File)
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