Sen. Barbara Boxer, a veteran of Democratic politics, says she never saw anything quite like this before.

Loud cursing, shouting, obscene gestures and vile insults, including crude comments about the female anatomy. It was all on display over the weekend as supporters of Bernie Sanders turned the Nevada State Democratic Convention into chaos.
“I was not able to stop these people for doing what they did,” Boxer, a Hillary Clinton supporter, told CNN. “Apparently they’ve done it before. …. This group of about 100 were very vocal, and I can’t describe it — disrespectful doesn’t even explain it, it was worse than that.”
READ: Changing super delegate rules would still leave Sanders behind
Boxer is hardly the lone Clinton supporter to experience such harassment on the campaign trail. Several top Democrats told CNN publicly and privately that the energy and enthusiasm of Sanders supporters has at times descended into incendiary attacks that threaten to tear apart efforts to unite Democrats against Donald Trump. Several female senators told CNN the attacks have been misogynistic.