Well, it was the WAY they worked against him.
There was an active campaign within a secret group to not let bernie win, tosteal it from him if necessary, no matter what, they would not let him win even if he did.
Yes, and remember Tulsi Gabbard was 2nd in command and had no power to stop Debbie. First thing Perez does? Gets Ellison appointed 2nd in command.