I know too many people that are not marxists in any way/shape/form, but are single issue or small set of issues voters, who are disgusted with Trump and are voting anti-incumbent in response to him.
When asked for policy items, they can't elicit much. Pussy grabbing, masochism, distaste for him.
I expect a huge amount of vanilla-soft-serve-Joe's votes will come from similar voters. They're not excited FOR Joe. Or any of his policies. They don't really know his policies. They just know he's not Trump. They certainly aren't showing up at any rallies.
Trump could have done a lot better for himself if he dug deep and found that piece of himself that waited off-stage for Dr. Carson during the introduction snafu at one of the debates in 2016. That was gentlemanly. It won a lot of respect from a lot of different types of people. And that Trump hasn't been present in a long time.