Republican presidential candidate Mitt Romney and his wife, Ann, campaign at Tradition Town Square in Port St. Lucie, Fla., on Sunday, Oct. 7, 2012. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

Republican presidential candidate Mitt Romney and his wife, Ann, campaign at Tradition Town Square in Port St. Lucie, Fla., on Sunday, Oct. 7, 2012. (AP Photo/Charles Dharapak)