Colorado Democrats pack a gym at a Denver high school during caucuses on March 1, 2016. The crowds and long lines have led to calls for the state to move to an open primary system. Marc Piscotty/Getty Images hide caption

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Marc Piscotty/Getty Images

Americans Don't Like Caucuses, But Replacing Them With Primaries Isn't Easy

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Ahead of the California primary, Sen. Bernie Sanders speaks at a campaign rally at Ventura College on May 26, 2016 in Ventura, California. The David McNew/Getty Images hide caption

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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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House Majority Leader Eric Cantor of Virginia takes the podium to speak to reporters on Capitol Hill in Washington, on Wednesday. He announced that he would step down as majority leader on July 31. Charles Dharapak/AP hide caption

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Former Rep. Ben Jones, a Democrat, wrote an open letter calling on voters to oust Eric Cantor in the Republicans' open primary — an event that transpired Tuesday. A former actor, Jones played the role of Cooter on TV show The Dukes of Hazzard. He's seen here meeting a fan last year. Erik S. Lesser/EPA /LANDOV hide caption

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Erik S. Lesser/EPA /LANDOV