

Republican presidential candidate, former Massachusetts Gov. Mitt Romney applauds after addressing a crowd of supporters with his wife Ann and their sons Matt, Josh, Craig and Tagg behind him during a Romney for President Iowa Caucus night rally in Des Moines, Iowa, Jan. 3, 2012. Romney beat former Sen. Rick Santorum of Pennsylvania by eight votes. Charlie Neibergall/AP
Democratic Senator Ted Kennedy (r.) and his Republican challenger, businessman Mitt Romney, shake hands at the start of their first debate of the campaign for the US Senate at Boston's Faneuil Hall on Oct. 25, 1994. Mr. Kennedy won the election. Jim Bourg/Reuters/File
Mitt Romney, president of the organizing committee of Salt Lake Winter Olympic Games, sings the national anthem as he raises an Olympic torch during a handing-over ceremony in Athens' Panathenean stadium on Dec. 3, 2001. Yiorgos Karahalis/Reuters/File
Mitt Romney holds up a Boston newspaper announcing his victory in the Massachusetts Governor's race during his acceptance speech in Boston on Nov. 5, 2002. Mr. Romney served as governor from 2003 to 2007. Jim Bourg/Reuters/File
Massachusetts Gov. Mitt Romney speaks to opponents of gay marriage at a rally at the Massachusetts State House in Boston on Nov. 19, 2006. Romney called for the state's highest court to intervene to let voters vote on a proposal to ban gay marriage. Brian Snyder/Reuters/File
Former Massachusetts Gov. Mitt Romney waves as he holds his granddaughter Grace while standing onstage with his wife Ann, his five sons, their wives, and his eight grandchildren, after formally announcing his campaign for president of the United States during a rally at the Henry Ford Museum in Dearborn, Mich., on Feb. 13, 2007. Rebecca Cook/Reuters/File
Political activists Matthew Lesser (r.) and Shannon Matson wear flip-flop costumes as they protest outside an event where GOP presidential candidate Mitt Romney was scheduled to receive an award from an anti-abortion group in Agawam, Mass., on May 10, 2007. Mr. Romney was critized for changing his positions on abortion and gay rights and equivocating on other policy issues, like immigration and gun control. Charles Krupa/AP/File
Ann Kalifrath listens to Republican presidential candidate former Massachusetts Gov. Mitt Romney speak at a Tea Party Express rally in Concord, N.H., on Sept. 4. The Tea Party has not embraced Mr. Romney as a candidate. Jim Cole/AP/File
Republican presidential candidate former Massachusetts Gov. Mitt Romney and his wife Ann head into the crowd at a Tea Party Express rally in Concord, N.H., on Sept. 4. Jim Cole/AP/File
Republican presidential candidates, from (l.), Rep. Michele Bachmann (R) Minnesota, former Massachusetts Gov. Mitt Romney, and Texas Gov. Rick Perry cover their hearts during the playing of the National Anthem before a Republican presidential debate in Tampa, Fla., on Sept. 12. Chris O'Meara/AP/File
Republican presidential candidate former Massachusetts Gov. Mitt Romney gestures during a campaign stop at a VFW Post in Milford, N.H., on Oct. 10. Steven Senne/AP/File
Businessman Herman Cain (l.) looks on as former Massachusetts Gov. Mitt Romney speaks during a debate by Republican presidential hopefuls at Dartmouth College in Hanover, N.H., on October 11. Adam Hunger/Reuters/File