Illinois state Rep. Mike Bost argues about gun legislation in 2013. Bost's angry rants have become a campaign issue in his race against Democratic Rep. Bill Enyart for Enyart's U.S. House seat. Seth Perlman/AP hide caption

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Darius Foster says he wants to challenge racial and political expectations. "With me, unfortunately, everything is black Republican. Not Darius did this, but the black Republican did that." Debbie Elliott/NPR hide caption

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Rep. John Barrow speaks at First African Baptist Church in Dublin, Ga. Barrow needs African-Americans to turn out on Election Day, but they're not enough to put him over the top. Sarah McCammon/NPR hide caption

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Frank Mankiewicz, Sen. Robert F. Kennedy's press secretary, updates the media about Kennedy's condition after being shot in June 1968. Mankiewicz died Thursday at the age of 90. AP hide caption

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Lacey Williams (from left), Mary Espinosa, Jaime Villegas, Armando Cruz Martinez and Elisa Benitez talk inside the offices of the Latin American Coalition in Charlotte, N.C. According to a 2011 Pew Hispanic report, the median age of Latinos in North Carolina is 24. Andy McMillan for NPR hide caption

itoggle caption Andy McMillan for NPR

Tom Steyer recently said in a video that "climate change is not just an important issue, it's the issue. And we need leaders who will take it seriously." Isaac Brekken/Getty Images hide caption

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