I'd guess he's not alone.
He is expecting a Trump collapse. That would be wonderful.
I am hoping for one, but it's amazing how it hasn't happened yet given what a terrible candidate he is.
At the moment, my sense is he will get around 47% and she can draw in up to 53% if she gets things very right, but less if she doesn't (losing points to third parties). But if she wins the ground game, which I think she will because a lot of Republicans must be holding their noses, then the difference could be greater.