Republican presidential candidate Mitt Romney pauses during a visit to St. Paul's Lutheran Church while campaigning in Berlin, N.H., on Dec. 22. Charles Krupa/AP hide caption

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Many experts say reducing mortgage principal can help troubled homeowners stay in their homes. But two of the nation's largest mortgage holders, Fannie Mae and Freddie Mac, have not signed on to the idea. Justin Sullivan/Getty Images hide caption

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Former Massachusetts Gov. Mitt Romney shakes hands at a campaign rally at Capital University in Bexley, Ohio, on Wednesday. Justin Sullivan/Getty Images hide caption

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The film Act of Valor, commissioned by the Naval Special Warfare Command, uses active-duty SEALs and professional actors to tell a fictional story. Courtesy of IATM LLC/Relativity Media hide caption

itoggle caption Courtesy of IATM LLC/Relativity Media

YouTube's history and search history are separate tabs that users may want to use to clear their past usage, as seen in this screen grab. NPR hide caption

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Mitt Romney narrowly won in Michigan Tuesday night. For Super Tuesday, he'll set his sights on Ohio, Massachusetts, Vermont and Virginia. Bill Pugliano/Getty Images hide caption

itoggle caption Bill Pugliano/Getty Images