Notice how the principled Sanders endorsers (Merkley, Grijalva) are uniting behind Clinton, unlike the opporunistic ones (Gabbard).
Don't forget Nina Turner and Erin Bilbray, who were initially diehard Hillary supporters and then turned into Sanders PUMAs virtually overnight. My guess is Hillary's campaign snubbed them for positions they wanted, and they decided to respond with temper tantrums.
I remember when I said back in the day that Gabbard was no liberal heroine and that her endorsement of Sanders was entirely self-serving, only to see Kalwejt and the socktroll who's obsessed with me to tag-team and accuse me of being on Clinton's payroll.
Fun times.