Democratic Trump equivalent?

[Fuzzy Bear]

Maxine Waters
Alcee Hastings (impeached and convicted as a Federal Judge, only to be elected to Congress)
Al Sharpton
Bill DeBlasio

Alan Grayson is in a class by himself.  He's one of the few liberals I could imagine being successful in the kind of Talk Radio that the Rush Limbaughs , Howie Carrs, and Mark Levins do.

[Fuzzy Bear]

Trump could have won the Democratic nomination with his trade and foreign policy positions if he hadn't done the Birther schtick.  He'd have to have run a different kind of campaign, however, and it would have had to be in a year where the Democrats felt a bit hard-pressed to win (e. g. 2004).