Woody Allen once said that 90% of life is just showing up, and Biden was there.
Some Trump fans suggested that he might be a no-show.
I think he did fine, and Trump didn't come off particularly well. He kept trying to talk over Biden and rebut Biden when it was Biden's turn to speak. The moderator had to ask him to stop repeatedly. If Biden was going to have a "senior moment" this constantly trying to interrupt him would make it difficult for that to happen. I think he came off as a boor and a bully. Biden did well enough that I don't think he will lose support. I don't think anyone's mind was changed by what either candidate said.
To be sure, I don't think Biden is a good debater and his performance wasn't very impressive, but the bar was set so low that just showing up was almost enough. And also, Trump was just Trump. I don't think he scored any knockout.
Are there really still any undecided voters who were waiting to watch the debates before making up their mind? If so, will this help them to decide?