Sen. Jon Tester, D-Mont., receives a kiss from his grandson Wednesday in Great Falls, Mont. Tester won re-election in a tight contest with Republican Rep. Denny Rehberg. Michael Albans/AP hide caption

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Democratic presidential candidate George McGovern talks about the bombs being used in Vietnam at a $250-a-person fundraising dinner in Los Angeles on Sept. 27, 1972. AP hide caption

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Voters these days often reward politicians who sit at either end of the ideological spectrum while punishing those seen as compromisers. iStockphoto.com hide caption

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Republican presidential nominee Mitt Romney meets audience members after he addressed the U.S. Hispanic Chamber of Commerce in Los Angeles on Monday. Charles Dharapak/AP hide caption

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President Obama spoke at a campaign event at Strawbery Banke Museum in Portsmouth, N.H., on Friday. Pablo Martinez Monsivais/AP hide caption

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August 2011: President Obama (right) and House Speaker John Boehner at the White House as they and other lawmakers worked to head off a government shutdown that loomed. Jewel Samad /AFP/Getty Images hide caption

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