Former Kentucky Gov. Steve Beshear, seen on Capitol Hill in 2013, delivered the Democratic Party response to President Trump's speech to Congress on Tuesday night. Jim Watson/AFP/Getty Images hide caption

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Democratic presidential candidate Sen. Bernie Sanders speaks to an overflow crowd through a megaphone after a campaign event May 27, 2015, at New England College in Concord, N.H. Win McNamee/Getty Images hide caption

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Bernie Sanders Calls For 'Fundamental Reassessment' Of Democratic Party

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Former Pennsylvania Attorney General Kathleen Kane arrives at Montgomery County courthouse for her scheduled sentencing hearing Monday in Norristown, Pa. Matt Rourke/AP hide caption

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Matt Rourke/AP

People in the audience cheer as Democratic presidential candidate Hillary Clinton speaks during a campaign event at a high school in Phoenix in March 2016 ahead of the Arizona primary. Carolyn Kaster/AP hide caption

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Carolyn Kaster/AP

Is Arizona A Swing State This Year?

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A supporter of Green Party candidate Jill Stein holds a doctored Bernie Sanders sign at a rally at City Hall in Philadelphia during the Democratic National Convention last month. Nicholas Kamm /AFP/Getty Images hide caption

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The Democratic National Committee headquarters in Washington, which also houses the Democratic Congressional Campaign Committee. The computer networks of both the DNC and DCCC have been hacked; investigators say Russia is the likely culprit. Paul Holston/AP hide caption

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Clarissa Rodriguez of Texas, 17, and Ruby Gilliam of Ohio, 93, recite the Pledge of Allegiance during the first day of the Democratic National Convention in Philadelphia on Monday. They are the youngest and oldest delegates at the convention. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

DNC's Oldest Delegate's Life Spans Early Days Of Suffrage To Historic Nomination

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On Last Big Primary Day, Presumptive Candidates Pivot To General Election

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AP: Clinton Heads Into Final Primaries With Enough Delegates For Nomination

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Sen. Bernie Sanders, an independent from Vermont, speaks during a campaign event in Los Angeles, Calif., on March 23. Patrick T. Fallon/Getty Images hide caption

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Patrick T. Fallon/Getty Images

Making Democrats' Primaries More Open Could Be Harder Than You Think

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