When he said he didn't care about Clinton's emails in the first debate, and then in the 2nd apologizing profusely, the Dem base knows that he has no shot of winning and that Sanders is simply there to provide comic relief and bring in the OWS/BLM crowd.
Hillary KNOWS that if Biden or Warren enters the race, she would get destroyed.
Biden would have beaten her, I think.
Warren, no, she’s Sanders with alleged lady parts. Too late for new entries now. She will be the nominee.