Jessica Kourkounis/Getty ImagesBernie Sanders said he'd "do everything" to get Hillary Clinton elected president in a major Monday night address to the Democratic National Convention that came as leaders aimed to quell remaining divisions within the party. Thanking the audience in Philadelphia, which gave him a booming cheer as he took the stage, Sanders acknowledged that he knew "many people here in this convention hall and around the country are disappointed" about how the primary election turned out. "I think it’s fair to say that no one is more disappointed than I am," he said.