President Obama said he regrets that the rancor between the parties has grown during his watch. "I guarantee I'll keep trying to be better so long as I hold this office," he said. Susan Walsh/AP hide caption

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Vice President Joe Biden announces he will not seek the 2016 Democratic presidential nomination during an appearance in the White House Rose Garden with President Obama and Dr. Jill Biden. Carlos Barria/Reuters/Landov hide caption

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Hillary Clinton reacts to host Jon Stewart on The Daily Show in 2014. According to a new survey, Bernie Sanders' supporters are more likely to watch the show than are Clinton's supporters. Frank Franklin II/AP hide caption

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Whose Supporters Like Cheap Flights, 'The Daily Show' And Fracking?
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Hillary Clinton speaks at the Democratic National Committee's summer meeting in Minneapolis, where she was trying to court all-important party delegates to her side. Jim Mone/AP hide caption

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Vice President Biden laughs as he is introduced by DNC Chair Rep. Debbie Wasserman Schultz, D-Fla., at the DNC Women's Leadership conference in Washington, Friday. At the event, Biden praised former GOP Sen. Bob Packwood, who resigned from the Senate in 1995 after allegations of sexual misconduct. Manuel Balce Ceneta/AP hide caption

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President Obama and Vice President Biden on Friday debuted the "It's On Us" campaign to help colleges and universities prevent and respond to sexual assault on campus. J. Scott Applewhite/AP hide caption

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Vice President Biden addresses Democratic activists Thursday at Netroots Nation in Detroit. Carlos Osorio/AP hide caption

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Biden: Loved By The Left, But With Limits
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Vice President Joe Biden speaks after a welcoming ceremony at the Great Hall of the People in Beijing Wednesday. Biden met with China's president to discuss issues that include China's recent claim of an air defense zone. Lintao Zhang/Getty Images hide caption

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