Vice President Joe Biden smiles after filing papers for President Obama to be on the N.H. primary ballot. (AP Photo/Jim Cole)

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HANOVER, NH - OCTOBER 11: (L-R) Jon Huntsman, U.S. Rep. Michele Bachmann (R-MN), Texas Gov. Rick Perry, Herman Cain and Mitt Romney laugh during the Republican Presidential debate hosted by Bloomberg and the Washington Post on October 11, 2011 at Dartmouth College in Hanover, New Hampshire.

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GOP presidential hopeful Rep. Michele Bachmann speaks at a rally on August 19, 2011 in Mt Pleasant, South Carolina. Richard Ellis/Getty Images hide caption

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Rep. Gabrielle Giffords (D-AZ), center, is welcomed by her fellow members of the the House of Representatives as she appears on the floor for the first time since her shooting earlier this year. Anonymous/AP hide caption

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Speaker of the House Rep. John Boehner (R-OH) poses for photographs after his televised address to the nation about the federal budget and debt ceiling crisis at the U.S. Capitol July 25, 2011. Chip Somodevilla/Getty Images hide caption

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