Democrats on Monday opened their convention in Philadelphia with rousing speeches from Bernie Sanders, Cory Booker, Michelle Obama and Elizabeth Warren.

With a scandal over leaked emails that appeared to show Democratic National Committee (DNC) staffers favoring Hillary Clinton over Sanders, her primary rival, lingering over the Wells Fargo Center, Democrats got a rocky start.

Earlier in the day, Sanders was booed during an address to his delegates in which he endorsed Clinton for president. “Brothers and sisters. This is the real world that we live in,” Sanders told his supporters.

More boos were heard on the convention floor. When comedian Sarah Silverman, who supported Sanders in the primary, attempted to make light of the situation – “Can I just say to the 'Bernie or Bust' people, you're being ridiculous” – the fraction only grew louder.

New Jersey Senator Cory Booker's speech emphasized diversity.

“Tolerance says I am just going to stomach your right to be different,” he said. “That if you disappear from the face of the earth, I am no better or worse off. But love – love knows that every American has worth and value, no matter what their background, race, religion, or sexual orientation. Love recognizes that we need each other, that we as a nation are better together, that when we are divided we are weak, we decline, yet when we are united we are strong – invincible!”

First Lady Michelle Obama spoke of the kind of leaders she wants influencing the next generation: “This election, and every election, is about who will have the power to shape our children for the next four or eight years of their lives.”

Massachusetts Senator Elizabeth Warren called on delegates to “work our hearts out to make Hillary Clinton the president of the United States.”

In the night's final speech, Sanders reiterated his support for Clinton: “Hillary Clinton will make an outstanding president. And I am proud to stand with her tonight.”