New Jersey Gov. Chris Christie greets supporters at a campaign event for Scott Brown (center left) in Salem, N.H. Elise Amendola/AP hide caption

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Former Secretary of State Hillary Clinton, former President Bill Clinton and U.S. Sen. Tom Harkin work the grill during Harkin's annual fundraising steak fry in Indianola, Iowa, on Sunday. Charlie Neibergall/AP hide caption

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Republican Gov. Sam Brownback (left) listens while his Democratic challenger Paul Davis answers a question during their first debate at the Kansas State Fair. Charlie Riedel/AP hide caption

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Republican Sen. Pat Roberts (left) and independent candidate Greg Orman shake hands after a debate at the Kansas State Fair on Saturday in Hutchinson, Kan. Charlie Riedel/AP hide caption

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President Gerald Ford and First Lady Betty Ford, with Jack and Susan Ford at their Alexandra, Va. home on August 12, 1974. The Ford family lived there for ten days until the executive mansion was ready. David Hume Kennerly/Getty Images hide caption

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A portrait of then-Sen. Warren G. Harding a few years prior to being elected president in 1920. Harding typically ranks near the bottom of U.S. presidents — but a steamy trove of love letters is putting him back in the public eye. Library of Congress hide caption

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President Obama waves before boarding Air Force One prior to his departure from Andrews Air Force Base on June 26. Jose Luis Magana/AP hide caption

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Sen. Mary Landrieu, D-La., talks with her father, former New Orleans Mayor Moon Landrieu, on Feb. 1. The two appear together in recent television ads for her re-election campaign. Gerald Herbert/AP hide caption

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