They're booing on-stage supporters of the party's presidential nominee and they're holding up and waving cranky "anti-TPP" signs and in general they're behaving like a bunch of little shits. Many a non-partisan viewer will be impressed by the spectacle of a seemingly divided party, even though four out of five Sanders supporters say they now support Hillary Clinton.
This week could be an absolute p.r. disaster for the Dems. And if it is, the turmoil will be the result of a populist mania that in spirit is more Tea Party than progressive.
That's been the danger all along — that of uncorking mass delusions peddled as a political program. In the end, what you get is little more than a horde of dimwitted hooligans.