Republican presidential candidate, former Massachusetts Gov. Mitt Romney, talks with chief strategist Stuart Stevens on his campaign bus as they drive from Naples, Fla., to Hialeah, Fla., Sunday, Jan. 29, 2012. (AP Photo/Charles Dharapak)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, talks with chief strategist Stuart Stevens on his campaign bus as they drive from Naples, Fla., to Hialeah, Fla., Sunday, Jan. 29, 2012. (AP Photo/Charles Dharapak)