“Is it not possible that corruption is so bad in some states that any voting has been essentially useless...”
I believe it’s very possible.
The rats have everything pretty well locked down here, imo, except for a few isolated red pockets here and there.
California voters have been disenfranchised for decades.
Ill-Annoy says "Hold my beer!"
Looking at the county by county map, some counties that were red four years ago are blue this year, interesting.
https://electionresults.sos.ca.gov/returns/maps/president