Democratic National Committee delegates in San Francisco voted against a debate focused on climate change. The 222-137 vote said they would not allow candidates to participate in such a primary debate. DNC chair Tom Perez said it was unfair to highlight some issues over others in a debate. According to Gizmodo, the DNC worries this may open the door to other single-issue debates. In September there will be two presidential forums allowing candidates to explain their platforms.

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