@RonSupportsYou Oh no, not at all.
It's not that Biden and Harris underestimated Trump and therefore lost to him, is that they were shit candidates. It's that as bad as Trump was, Democratic establishment figures overestimated Biden and Harris.
Trump won by default because Democrats ran shit candidates that nobody wanted to vote for. Just about anybody else would have beaten Trump.
The moment Democrats settled on Harris as the replacement candidate I threw up my hands and said well we're just screwed.
Democrats should have run a better candidate than Harris, but they basically forfeited the race to Trump by running her. It was pretty obvious to me at the time at least.