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Bernie Sanders to supporters at DNC: Unify behind Hillary Clinton

03:12

As the Democratic National Convention got underway without outgoing party chair Debbie Wasserman Schultz, Bernie Sanders urged supporters still itching for a fight on the floor of the convention to unify behind Hillary Clinton. Meanwhile, an emotional Michelle Obama contrasted Clinton with GOP nominee Donald Trump without naming him. NBC’s Andrea Mitchell reports from the Wells Fargo Center in Philadelphia. (Run time: 3:12)