MIAMI, FL - JANUARY 25: Republican presidential candidate, former Massachusetts Gov. Mitt Romney (C) is accompanied by (L-R) Rep. Connie Mack (R-FL), Rep. Ileana Ros-Lehtinen (R- FL) and former Congressman Lincoln Diaz-Balart (R-FL) as he arrives for a US-Cuba Democracy political action committee event January 25, 2012 in Miami, Florida. Romney is campaigning in Florida ahead of next Tuesday's state primary. (Photo by Chip Somodevilla/Getty Images) Chip Somodevilla / Getty Images

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, accompanied by, from right, Rep. Ileana Ros-Lehtinen, R-Fla.; former Florida Rep. Lincoln Diaz-Balart.; Romney's wife Ann; former Commerce Secretary Carlos Gutierrez; and former Florida Sen. Mel Martinez, campaigns at a US-Cuba Democracy Political Action Committee (PAC) Event at Freedom Tower, at Miami-Dade College, in Miami, Fla., Wednesday, Jan. 25, 2012. (AP Photo/Charles Dharapak) Charles Dharapak / AP

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, hugs an audience member as he campaigns at a US-Cuba Democracy Political Action Committee (PAC) Event at Freedom Tower, at Miami-Dade College, in Miami, Fla., Wednesday, Jan. 25, 2012. (AP Photo/Charles Dharapak) Charles Dharapak / AP

MIAMI, FL - JANUARY 25: Republican presidential candidate and former Massachusetts Gov. Mitt Romney (L) and his wife Ann Romney walk across the tarmac after arriving at Miami International Airport January 25, 2012 in Miami, Florida. Campaigning in Florida ahead of next Tuesday's primary, Romney came to Miami to partparticipate in a "Meet the Candidate" forum hosted by the Hispanic Chamber of Commerce and Univision at Miami-Dade College. (Photo by Chip Somodevilla/Getty Images) *** BESTPIX *** Chip Somodevilla / Getty Images

MIAMI, FL - JANUARY 25: Republican presidential candidate, former Massachusetts Gov. Mitt Romney addresses the US-Cuba Democracy political action committee during a campaign event January 25, 2012 in Miami, Florida. Romney is campaigning in Florida ahead of next Tuesday's state primary. (Photo by Chip Somodevilla/Getty Images) CHIP SOMODEVILLA / STAFF

MIAMI, FL - JANUARY 25: Supporters listen to Republican presidential candidate, former Massachusetts Gov. Mitt Romney address the US-Cuba Democracy political action committee during a campaign event January 25, 2012 in Miami, Florida. Romney is campaigning in Florida ahead of next Tuesday's state primary. (Photo by Chip Somodevilla/Getty Images) CHIP SOMODEVILLA / STAFF

MIAMI, FL - JANUARY 25: Remedios Diaz Oliver wears a campaign button for Republican presidential candidate and former Massachusetts Gov. Mitt Romney during a US-Cuba Democracy political action committee campaign event January 25, 2012 in Miami, Florida. Romney is campaigning in Florida ahead of next Tuesday's state primary. (Photo by Chip Somodevilla/Getty Images) CHIP SOMODEVILLA / STAFF