Convinced as Sanders is that he’s realizing his lifelong dream of being the catalyst for remaking American politics—aides say he takes credit for a Harvard Kennedy School study in April showing young people getting more liberal, and he takes personal offense every time Clinton just dismisses the possibility of picking him as her running mate—his guiding principle under attack has basically boiled down to a feeling that multiple aides sum up as: “Screw me? No, screw you.”

Take the combative statement after the Nevada showdown.

“I don’t know who advised him that this was the right route to take, but we are now actively destroying what Bernie worked so hard to build over the last year just to pick up two fucking delegates in a state he lost,” rapid response director Mike Casca complained to Weaver in an internal campaign email obtained by POLITICO.

“Thank you for your views. I’ll relay them to the senator, as he is driving this train,” Weaver wrote back.