President Obama greets the crowd after a Sept. 22 speech in Milwaukee. Carolyn Kaster/AP hide caption

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Some of the faces of those who supported the president, at his victory rally Tuesday in Chicago. Jewel Samad /AFP/Getty Images hide caption

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Obama has become only the third U.S. president to win re-election by a narrower margin than his first victory. Having won a second term, Obama will seek to set the nation's agenda on issues ranging from taxes to immigration, but he may continue to struggle in selling his ideas to Congress. Robyn Beck/AFP/Getty Images hide caption

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President Obama walks on stage with first lady Michelle Obama and daughters Sasha and Malia to deliver his victory speech on election night in Chicago. Win McNamee/Getty Images hide caption

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President Obama's performance in the first presidential debate cost him a lot. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images