IMHO it's less about "badly enough", I know very few people who are die-hard Trump supporters, but do know many centrist types who just aren't very enthusiastic with Biden and Harris in the past four years.

The Democrats should really pick someone more desirable for the majority of Americans. I know there are decent options, even if not the level of exciting as Obama was in 2008.

It's similar to 2016, and many people could not understand that much of the Trump vote was basically just not thrilled about Hillary Clinton, and was hardly a rally behind Trump.