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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Democratic presidential candidate Bernie Sanders says his campaign and supporters were not treated fairly during last Saturday's Nevada Democratic convention. Charlie Neibergall/AP hide caption
Democratic presidential candidate Hillary Clinton takes selfies with supporters at a campaign stop in Indianapolis on Sunday. Paul Sancya/AP hide caption
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
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
Homepage of Superdelegatelist.com Super Delegate List/Screen shot by NPR hide caption
Republican presidential candidate, Sen. Marco Rubio, R-Fla., speaks in Toa Baja, Puerto Rico, on Saturday. Paul Sancya/AP hide caption
John Evans, dressed as Uncle Sam, waits for Ted Cruz to take the stage during an election night watch party in Stafford, Texas on Tuesday. David J. Phillip/AP hide caption
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
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
Big Tex at the State Fair of Texas in Dallas. Patricia Marroquin/Moment Editorial/Getty Images hide caption
5 Reasons Texas Matters More For The GOP Nomination Than Iowa Or N.H.
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
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
GOP hopeful Rick Santorum, shown greeting supporters in Minnesota on Tuesday, drew votes in the Feb. 7 contests. But he didn't win any delegates. Craig Lassig/EPA/Landov hide caption