Sen. Elizabeth Warren was repeatedly heckled Monday night as she delivered a speech endorsing Hillary Clinton to the Democratic National Convention in Philadelphia. “We trusted you! We trusted you!” chanted factions of the audience comprised of individuals who were apparent supporters of Bernie Sanders and were seemingly upset with Warren’s endorsement of Clinton. Loud boos and jeers came soon after, when the Massachusetts senator said it was imperative that Clinton and Tim Kaine, her running mate, were elected to the White House.