I think a re-vote would violate US Law, which sets the date for Federal elections...
Yes, but states are allowed to do run-offs per their own legislation. You may be right, but if the court stated there was no other remedy short of invalidating all of the ballots because there is no chain of custody (as required by law), there was no observation (as required by law), and there was no verification (as required by law) then the court may put it back on the legislature.
It is a mess, but ignore the media spin and let us all acknowledge that there is no way to fix it now. It is done.
Good point about the run offs, a la Georgia, but I would imagine that law would have to already be in place at the time of the election that took place. Else, you could have a legislature overturn any election they didn’t agree with, by changing laws, forcing re-votes etc endlessly.
This game will play out by the rules already in place. The key will be getting the right judges (courts) to interpret the rules.