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Republican presidential candidate former Massachusetts Gov. Mitt Romney addresses an audience during a campaign stop in Rockford, Republican presidential candidate former Massachusetts Gov. Mitt Romney walks to speak to supporters at his Nevada caucus night vi Courtesy photo Family photo from the 1960s provided by Romney for President Inc. shows Mitt Romney, left, and brother Scott with t Jim Cole | AP file photo Republican presidential candidate Mitt Romney speaks during a campaign stop with mill workers at the Ma Steven Senne | The Associated Press Republican presidential candidate Mitt Romney addresses an audience as his wife, Ann, looks Evan Vucci | The Associated Press Republican presidential candidate Mitt Romney shops with his wife, Ann, left, and Puerto Rican Steven Senne | The Associated Press Republican presidential candidate Mitt Romney lifts 8-month-old Gavin Woodford, of Rockford, Steven Senne | The Associated Press Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the Unive Courtesy photo This 1957 family photo provided by Romney for President Inc. shows George Romney and son Mitt in their Detroit, Mic C.J. Gunther | AP file photo Republican U.S. Senate candidate Mitt Romney greets supporters at the Columbus Day parade in Worces Scott Gries | AP file photo Thomas S. Monaghan, founder and chairman of Domino's Pizza Inc., left, and Mitt Romney, managing dir Courtesy photo This 1965 photo provided by Romney for President Inc. shows Mitt Romney with his future wife, Ann Davies, on the da Courtesy photo This 1953 photo provided by Romney for President Inc. shows 6-year-old Mitt Romney with a baseball bat in Detroit.