This isn't exactly answering the question, but Biden needs to drop out, period.
Only his BIG ego is keeping him up there, running. He does NOT deserve to win. He is not in control of all his mental faculties. And at his age, this situation is not going to get better. All of his abilities are slowing down and are no match for the Presidency.
He and also Bernie need to drop out, period. Let the younger smarter ones lead from here.
Please.
He, Sanders, AND Warren need to drop out. All three, not just one or two