Vice President Hubert Humphrey (right) and his running mate, Sen. Edmund S. Muskie, wave to the crowd with their wives at the Democratic Convention in Chicago on Aug. 29, 1968. Violence ensued inside and outside the convention hall. AP hide caption

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AP

Supporters of Republican presidential candidate Sen. Ted Cruz attend the Colorado Republican Convention in Colorado Springs on April 9. Jason Connolly/AFP/Getty Images hide caption

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Jason Connolly/AFP/Getty Images

Supporters of Democratic presidential candidate Sen. Bernie Sanders cheer and hold up signs, including one of Sanders, during a campaign rally at Colorado State University Sunday. Jacquelyn Martin/AP hide caption

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Jacquelyn Martin/AP

Hillary Clinton, former secretary of state and 2016 Democratic presidential candidate, hugs Geneva Reed-Veal, the mother of Sandra Bland, during a campaign rally in Chicago. Bloomberg/Bloomberg via Getty Images hide caption

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Bloomberg/Bloomberg via Getty Images

Big Tex at the State Fair of Texas in Dallas. Patricia Marroquin/Moment Editorial/Getty Images hide caption

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Patricia Marroquin/Moment Editorial/Getty Images

5 Reasons Texas Matters More For The GOP Nomination Than Iowa Or N.H.

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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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Jim Cole/AP

Polls show Rick Santorum and Mitt Romney in a tight race heading into Tuesday's Michigan primary. Santorum's campaign signs are stuck in the snow before his campaign stop at the The Colonial Valley Suites on Feb. 26 in Davison, Mich. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images