I think the Dems didn't realize that the deadly pandemic was a one time thing.
Still it's pretty wild that such a big chunk of the Democrat vote didn't show up even if it just increased the numbers in solid blue states.
Another fun graph I looted from ResetEra
I still don't understand how the Harris campaign thought that Republicans on the eve of a great victory would suddenly turn on Trump because Liz Cheney, abortions and Puerto Rico.