Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves to supporters on the motorcade route after a campaign stop at LeClaire Manufacturing on Wednesday, Aug. 22, 2012 in Bettendorf, Iowa (AP Photo/Evan Vucci) Republican presidential candidate, former Massachusetts Gov. Mitt Romney and wife Ann wave to the crowd at The Gdansk Old Town Hall, in Gdansk, Poland, Monday, July 30, 2012. (AP Photo/Charles Dharapak) Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, introduces his vice presidential running mate, Wisconsin Rep. Paul Ryan, Saturday, Aug. 11, 2012 in Norfolk, Va. (AP Photo/Virginian-Pilot, Amanda Lucier) Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign stop at LeClaire Manufacturing on Wednesday, Aug. 22, 2012 in Midland, Texas. (AP Photo/Evan Vucci) Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign stop at LeClaire Manufacturing, Wednesday, Aug. 22, 2012, in Bettendorf, Iowa. (AP Photo/Evan Vucci) FILE - In this Aug. 21, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney arrives at Louis Armstrong New Orleans International Airport in New Orleans. This is the convention prelude of the Republicans' dreams _ their nightmares, that is. Mitt Romney wanted to preside over a made-for TV gathering showcasing his economic credentials and GOP unity. Instead, he's heading to Tampa with the national debate focused on rape and abortion and with the divisions within his party on full display. (AP Photo/Evan Vucci, File) The family of Michigan Governor George Romney concentrate on his words as he addresses the platform committee of the Republican National Convention in San Francisco, July 8, 1964. From left to right: Lenore Romney, Mitt Romney and Scott Romney. Woman at right is unidentified. (AP Photo) FILE - In this Feb. 2, 1994 file photo, Mitt Romney, right, chairman of the Boston-based management consulting firm Bain and Company, acknowledges the crowd after announcing his candidacy as a Republican for the U.S. Senate seat held by Sen. Edward Kennedy, D-Mass, in Boston. With Romney on stage are, from left to right, his mother Lenore Romney, his father George Romney, former governor of Michigan and one-time presidential candidate, and wife Ann. (AP Photo/Jon Chase, File) From right, Michigan Governor George Romney, his wife Lenore, daughter Lynn and son Mitt walk along a street at the World's Fair en route to the General Motors Pavilion in the Queens borough of New York, May 18, 1964. (AP Photo) SPECIAL SALT LAKE CITY TRIBUNE--This is an October 1994 file photo of Boston businessman Mitt Romney, second from right, with his late father George and his mother Lenore. Romeny's wife Ann is at right. (AP Photo/Charles Krupa) (Tribune file photo) George Romney Mitt Romney in 1994 with his father, former Michigan Gov. George Romney. Courtesy of Mitt Romney campaign Republican presidential candidate, former Massachusetts Gov. Mitt Romney makes a stop at Millie's to talk with voters before attending a fundraising event on Saturday, Aug. 18, 2012 in Nantucket, Mass. (AP Photo/Evan Vucci) Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign rally, Monday, Aug. 20, 2012, in Manchester N.H. (AP Photo/Evan Vucci) This 1957 family photo provided by Romney for President, Inc., shows George Romney, left, and son Mitt Romney, right, in their Detroit, Mich., home. (AP Photo/Romney Family Via Romney For President, Inc.) FILE - In this Oct. 10, 1994, file photo, Republican U.S. senatorial candidate Mitt Romney greets supporters at the Columbus Day parade in Worcester, Mass., following his father's path into politics. (AP Photo/C.J. Gunther, File) FILE - In this Nov. 5, 2002, file photo, Massachusetts Republican gubernatorial candidate Mitt Romney waves to supporters in Boston after making his victory speech. The victory sharpened the parallels with the life of his father George Romney: successful businessman, dedicated family man and, now, governor. (AP Photo/Steven Senne, File) Former Republican presidential hopeful Mitt Romney, right, announces his support for Republican presidential hopeful, Sen. John McCain, R-Ariz., Thursday, Feb. 14, 2008, during a news conference in Boston. (AP Photo/Gerald Herbert) Republican presidential candidate, former Massachusetts Gov. Mitt Romney waits backstage to be introduced during a campaign stop at LeClaire Manufacturing on Wednesday, Aug. 22, 2012 in Bettendorf, Iowa (AP Photo/Evan Vucci) Republican presidential candidate, former Massachusetts Gov. Mitt Romney gets into his car to attend a fundraising event on Saturday, Aug. 18, 2012 in Nantucket, Mass. (AP Photo/Evan Vucci)