As a Brit looking in from the outside, it’s hard for me to understand how choices have been made in this election, but if I were to attempt a charitable take, did Trump win because he tunes in to some sort of low level anger/resentment/frustration felt by a chunk of the population?
Whereas the Democrats, more polished perhaps as they are, have failed to make that connection sufficiently?
And that connection - or whatever it is that the population picks up on from Trump, outweighs the “obvious flaws” that his detractors may point towards?
Ie they don’t vote for him because of his hyperbole and “questionable” behaviour, they vote for him in spite of that - for other reasons.
I can see the Democrats didn’t help matters by pushing Biden to run when he clearly shouldn’t have, though perhaps it was the lesser of two evils at the time (from their point of view) given his proven record of being able to actually beat Trump.
Happy to be corrected if this is a bad or naive analysis!!