Former Massachusetts Gov. Mitt Romney speaks during a town-hall meeting on Saturday, Dec. 17, 2011, in Charleston, S.C., while campaigning for the Republican presidential nomination. (AP Photo/Rainier Ehrhardt)

Photo by: Rainier Ehrhardt

Former Massachusetts Gov. Mitt Romney speaks during a town-hall meeting on Saturday, Dec. 17, 2011, in Charleston, S.C., while campaigning for the Republican presidential nomination. (AP Photo/Rainier Ehrhardt)