The chants told the story as Bernie Sanders took the stage at the Pennsylvania Convention Center on Monday afternoon, a few hours before the opening of the Democratic National Convention.

“Bernie or bust!”

“Take it to the floor!”

“Never Hillary!”

At least 300 Sanders partisans were in the ballroom, and more were gathered outside.

Sanders endorsed Hillary Clinton earlier this month. But his delegates are having a hard time letting go.

They liked it when Sanders said, “What we want to achieve is nothing less than a transformation of American society.” To cheers, he called for higher taxes on the wealthy and corporations, a $15-an-hour minimum wage, and no congressional passage of the Trans-Pacific Partnership during the remainder of Obama’s term.

But he wanted one more thing — to throw his backers’ support behind Hillary Clinton’s campaign against Donald Trump in the general election. The crowd responded with boos and cries of “no!”

“Brothers and sisters, this is the real world we live in,” Sanders pled. “Trump is a demagogue.”