If any democrat has a chance it would have to be Harris. Biden is done. He will never be the nominee now. Way to many back flips, comments about China, and his (oh, I ran out of time) debacle, the racism thing, his inability to think on his feet, and not left enough for the party. Warren was never even a consideration. She burned up whatever credibility she had long ago.
Harris is smart, and a go for the jugular kind of gal. She is (and can be) scrappy when she needs to be but she has some baggage that I don't think is sell-able. She wants to get rid of ICE, she will be pushing for tax payer funded free medical for Illegals, and the Kavanaugh fiasco isn't going to gander her any favor from the right or independent voters.
Coupled with running against (if it stays in place) a raging economy, unemployment numbers, stock market numbers, new job numbers, and if Trump gets a success with his China deal or Barr investigation into the FISA warrants I think it will be a bridge to far.
But what the hell do I know. My guess is as good as anyone elses.