Sanders supporters took over the Nevada Democratic Party. It’s not going well.

Judith Whitmer, the insurgent party chair who wrested control of the party from mainstream Democrats, is facing a challenge in her reelection campaign next month amid doubts from her own former supporters and accusations that she abandoned her progressive principles. And even key figures in Bernie world — including Sanders himself — say they are unhappy and embittered by what’s transpired.

“The senator is pretty disappointed in…