Without Obama's endorsement, he is done. I'll get back to this.
I don't doubt that you have observed what you say. However, that is not at all what I have observed. I have very consistently observed at what I estimate at 90+% "I won't vote for him in the primaries but blue no matter who in the general". That's what I hear from everyone with very few exceptions.
Biden slipped 10 points after the second night of the debates. If someone with no fame like Harris already gave him a fat lip, then no, I don't think he can beat Trump. If Trump is applauded for racism, how can Biden call him on it with his refusal to acknowledge his racial insensitivity?
Now, let's talk real shit. How is he going to recover without Obama's endorsement? Why in the world would Barack Obama squander his clout by endorsing him now? If there is one thing that I can tell you about Obama it is that he thinks about his influence before he does shit.
Now imagine a shrewd and calculating prosecutor cross-examining Donald Trump. Imagine her actually prosecuting him for his actual fucking crimes.
Harris 2020.