Dean's appeal didn't last that long.

As to Bernie, it wasn't so much anger as the sense his supporters had that he was believable. He was seen as speaking "truth to power". It wasn't that he was pissed-off and white(while HRC supporters saw him as less concerned with social oppression, but his supporters were not backing him because they saw him as a champion of white privilege.), it was that those who backed him thought he was telling the truth and that supporting him would expand the range of the possible, as opposed to the other primary candidate who, while deeply qualified, seemed to Sanders people to be spending most of her time telling Democratic voters to limit their expectations and give up on anything but the most limited forms of change possiblel. I'm not saying that was a fair perception

A lot of Sanders people are out there in the protests. Those who aren't should be.