Bernie Sanders asked his supporters to vote for Hillary. They booed and heckled him for it.

Bernie Sanders was loudly booed and heckled by his delegates and supporters in Philadelphia on Monday as he addressed them ahead of the Democratic National Convention. "We have got to defeat Donald Trump. We have got to elect Hillary Clinton and Tim Kaine," Sanders said as the crowd broke out in jeers and chants of "we want Bernie."

"Brothers and sisters!" Sanders yelled over the boos, trying to calm the crowd. "Brothers and sisters! This is the real world that we live in. Trump is a bully and a demagogue. Trump has made bigotry and hatred the cornerstone of his campaign."

The crowd finally quieted enough for Sanders to finish speaking, although his supporters have been in a riotous mood all day in Philadelphia, particularly in the wake of the DNC email leak that revealed some officials had wanted to tip the scales during the primary for Hillary Clinton. Earlier Monday, Democratic National Committee Chairwoman Debbie Wasserman Schultz was booed into silence by crowds waving "Bernie Sanders" and "Emails" signs.

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Sanders himself appeared nothing but grateful when speaking to his delegates, though. "This campaign has been a fantastic beginning," he said. "And from today onward, we continue the fight."