Republican presidential candidate Donald Trump during the third night of the Republican National Convention in Cleveland. Brendan Smialowski/AFP/Getty Images hide caption

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Listen To NPR Special Coverage Of The Convention

Indiana Gov. Mike Pence, the Republican vice presidential nominee, headlined Wednesday's event. But all eyes were on Ted Cruz earlier in the evening for his refusal to endorse Donald Trump. Win McNamee/Getty Images hide caption

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Democratic presidential candidate Bernie Sanders speaks during a rally in Washington, D.C., on June 9. Although he didn't win the nomination, Sanders' grass-roots fundraising has broken records. Alex Wong/Getty Images hide caption

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Will The Millions Of People Who Gave Money To Bernie Sanders Give To Democrats?

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

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