Democrats may not agree on much these days, but on the matter of their greatest wish, there is resounding consensus:

They want to beat Donald Trump this November. Full stop.

So it’s of no help to the cause when Hillary Clinton, the party’s 2016 nominee, disparages other Democrats and shatters party unity based on her own festering resentment.

“Nobody likes him,” Mrs. Clinton said of Senator Bernie Sanders, her rival for the Democratic nomination in 2016 and a leading candidate today, in a new documentary, according to The Hollywood Reporter. “Nobody wants to work with him, he got nothing done. He was a career politician. It’s all just baloney and I feel so bad that people got sucked into it.”

That’ll play nicely in a Trump campaign ad if Mr. Sanders is the Democratic nominee.

Worse, Mrs. Clinton declined to commit to campaigning for Mr. Sanders, or even supporting him, if he wins the nomination.

“I’m not going to go there yet,” she said in an interview with The Hollywood Reporter. “We’re still in a very vigorous primary season.”