I think Trump wins 40 states if it's him vs Biden.

I hope for the sake of the US and the planet that Bernie takes off the kiddie gloves on sunday, and starts hammering Biden on record, policy and electability.

What will happen if Biden is the nominee is that you'll have 24/7 attack ads featuring super cuts of Biden sniffing little girls, poking people with his finger, getting irrationally angry, talking gibberish and straight up lying about his voting history, civil rights, lying about being arrested in SA visiting Nelson Mandela, and attacking Anita Hill.
Biden voters have no fucking clue who this man is. They're going on name recognition. The image of Biden that's being pushed by MSM and the reality of who Biden is could not be further apart. Exit polls show people vote for him because of his position on healthcare. He's on camera saying this week that he'd veto M4A if it passed the house and the senate. They have no idea who he is, and when they find out, there will be a mass exodus of democrats.

I personally don't think Bernie's chances are as bleak as the raw numbers would suggest. I may say this out of self preservation because democrats picking Biden over Bernie would be an unimaginable tragedy and possibly the death of the party.
I see a real possibility of Biden face planting hard on live TV, if they allow him on TV, which is an if. I would not be shocked if sunday gets cancelled for [insert distraction].