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Photo by: Charlie Neibergall

** FILE ** In this May 27, 2011, file photo former Massachusetts Gov. Mitt Romney heads to his car after speaking at the Mediacom 2012 Presidential Candidate Series in Des Moines, Iowa. The accelerating GOP presidential campaigns in Iowa probably will define front-runner Romney’s chief challengers over the next six weeks and could oblige him to reconsider his decision to mount only modest efforts in this early voting state. (AP Photo/Charlie Neibergall, File)

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