Republican presidential nominee Mitt Romney speaks at a campaign fundraising event in Salt Lake City on Tuesday. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

Republican presidential candidate former Massachusetts Gov. Mitt Romney, right, makes a point as Texas Gov. Rick Perry listens, during a debate in Orlando, Fla. Phelan M. Ebenhack/AP hide caption

itoggle caption Phelan M. Ebenhack/AP