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.
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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.
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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.
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