Hillary, or Sanders, or Biden, or Warren ... any of them. I think the DEMs might do a “late switch”, the “Toricelli-swap” move. But whever is in the corsshairs before then is going to get it, I think even if Trump isn’t the nominee!
When Hillary collapses the Democrats can always vote for Trump. He is, after all, one of them. Trump can even switch parties. He has done it enough that he knows the process. Trump/Hillary, what a winning combination that would be! Bernie wouldnt run with Trump, sorry to say. Bernie may be a socialist loon but at least he is consistent about it.