Sen. Bernie Sanders (D-Vt.), opened his speech at Monday night's Democratic National Convention in Philadelphia by thanking his supporters and telling them "I look forward to your votes during roll call on Tuesday."
But later, Sanders changed his tune, endorsing the presumptive Democratic nominee and saying, "Hillary Clinton must become the next president of the United States. The choice is not even close."
The Vermont senator acknowledged his disappointment, and that of many his supporters who even went so far as to boo him when he tried to bring the party together, over the results of the nominating process.
"I understand that many people here in this convention hall and around the country are disappointed about the final results of the nominating process," Sanders said. "I think it's fair to say that no one is more disappointed than I am. But to all of our supporters - here and around the country - I hope you take enormous pride in the historical accomplishments we have achieved."
Sanders encouraged supporters to come together and help elect Clinton in November.
"If you don't believe this election is important," Sanders said, "[T]ake a moment to think about the Supreme Court justices that Donald Trump would nominate and what that would mean to civil liberties, equal rights and the future of our country."
Sanders noted that he and Clinton have their differences, but were able to come together to produce "the most progressive platform in the history of the Democratic Party."
Among other provisions, the Democratic Party now calls for breaking up the major financial institutions on Wall Street, the passage of a 21st Century Glass-Steagall Act, and opposing the Trans-Pacific Partnership.
"Our job now is to see that platform implemented by a Democratic Senate, a Democratic House and a Hillary Clinton presidency - and I am going to do everything I can to make that happen."
He concluded by saying Clinton will make an outstanding president.