Bernie Sanders today endorsed Hillary Clinton, his obligatory words of approval impressively audible through his thin smile.

The senator from Vermont appeared onstage with Clinton at a rally in Portsmouth, New Hampshire, apparently of his own free will and volition.

Hillary “will be the Democratic nominee for president and I intend to do everything I can to make certain she will be the next president of the United States,” Sanders said.

His decision to finally endorse Clinton reportedly followed weeks of negotiations between Clinton’s campaign manager, Robby Mook, Sanders’ campaign manager, Jeff Weaver, and Sanders’ wife, Jane, that led to Hillary rolling out a series of proposals in support of expanded access to healthcare, free college tuition, and a higher minimum wage.

Still, USA Today reports some of his supporters walked out of the rally when he announced he would be endorsing Clinton.

The rally drew supporters of Clinton and Sanders, some of whom chanted “Bernie” while others chanted “unity.” Some Sanders supporters left their seats when Sanders said he was endorsing Clinton. Earlier when Sen. Jeanne Shaheen said “we need to elect Hillary,” she was interrupted shouts of “NO!” and chants of “Bernie, Bernie.”

Here is the divisive announcement they missed (full text here):

“I have come here today not to talk about the past but to focus on the future,” Sanders said. “That future will be shaped more by what happens on November 8 in voting booths across our nation than by any other event in the world. I have come here to make it as clear as possible as to why I am endorsing Hillary Clinton and why she must become our next president.”

That’s politics, baby.