Bernie world descends into disarray

“A lot of Bernie's very active base are really enraged" by the actions of some supporters since Sanders dropped out, a former adviser said.

Bernie Sanders has shown that he can transform Democratic politics.

Harnessing the left-wing movement he created has been trickier.

Thousands of his former volunteers publicly warned him that their organizing networks are on the verge of falling apart since he dropped out of the presidential race five weeks ago. Ex-aides fear that the precious data they collected on his supporters, which could be used to elect...