Republican Gov. Chris Christie listens as Democratic challenger Barbara Buono answers a question during a debate at Montclair University in Montclair, N.J., on Oct. 15. Mel Evans/AP hide caption

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Rep. Elijah Cummings, D-Md., gestures as he speaks in an Oversight Committee hearing on Capitol Hill in May 22. Carolyn Kaster/AP hide caption

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Liz Cheney walks off the stage with her father, former Vice President Dick Cheney, after addressing the Conservative Political Action Conference in 2010. Cliff Owen/AP hide caption

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A worker guides a crane in Watford City, N.D. Oil production has tripled in five years, leading to rapid growth in some of the state's counties. Matthew Staver/Bloomberg via Getty Images hide caption

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The scandals affecting the Obama administration could make some would-be candidates leery of running for political office. Olivier Douliery/Pool/Getty Images hide caption

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Former South Carolina Gov. Mark Sanford arrives to give his victory speech Tuesday in Mount Pleasant, S.C. Sanford won back his old congressional seat in the state's 1st District in a special election. Rainier Ehrhardt/AP hide caption

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