Democratic presidential candidates Bernie Sanders, Hillary Clinton and Martin O'Malley stand on the stage prior to Saturday's Democratic primary presidential debate in Des Moines, Iowa. Alex Wong/Getty Images hide caption

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Hillary Clinton in New Hampshire, one of the early states she is vying for. She's neck and neck in polls there with Bernie Sanders of Vermont but leads in a big way nationally in endorsements. Jim Cole/AP hide caption

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Presidential candidates Hillary Clinton, Bernie Sanders and Martin O'Malley appear with Iowa Democratic Party Chair Andy McGuire (second from left) at Saturday's Jefferson-Jackson Dinner in Des Moines. Scott Olson/Getty Images hide caption

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Democratic Candidates Throw Shade, But Avoid Calling Each Other Out

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Democrats Bernie Sanders (from left), Hillary Clinton and Martin O'Malley debate in Las Vegas. Joe Raedle/Getty Images hide caption

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Break It Down: Democrats On Guns And Wall Street

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Supporters of Democratic presidential candidate Hillary Clinton cheer as she arrives at the state's annual Democratic convention Saturday in Manchester, N.H. Jim Cole/AP hide caption

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New Hampshire Democrats Unite In Cry For More Debates

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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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Former Maryland Gov. Martin O'Malley as he announces his intention to seek the Democratic presidential nomination during a speech in Federal Hill Park in Baltimore, Md. Jim Bourg/Reuters/Landov hide caption

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Former Maryland Gov. Martin O'Malley, a Democrat who is considering a 2016 presidential campaign, is interviewed by NPR's Steve Inskeep. Ariel Zambelich/NPR hide caption

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Part 1 Morning Edition's O'Malley Interview

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Former Florida Gov. Jeb Bush is one of four "un-candidates" being targeted by liberal groups Campaign Legal Center and Democracy 21. They say the politicians have crossed the line into candidacy based on their activities in recent months. Scott Olson/Getty Images hide caption

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