Former Massachusetts Gov. Mitt Romney, who is running for the 2012 Republican presidential nomination, speaks during a town-hall meeting in Miami on Wednesday, Sept. 21, 2011. Mr. Romney discussed his plans to improve the economy, create jobs and protect Social Security. (AP Photo/Alan Diaz)

Photo by: Alan Diaz

Former Massachusetts Gov. Mitt Romney, who is running for the 2012 Republican presidential nomination, speaks during a town-hall meeting in Miami on Wednesday, Sept. 21, 2011. Mr. Romney discussed his plans to improve the economy, create jobs and protect Social Security. (AP Photo/Alan Diaz)