I have found this one and a few other on Betmoose but that's it.
https://www.betmoose.com/bet/u_s_-presidential-election-winner-2020-5153
I saw the Cloudbet thread (and they do have good odds and volume) but they don't accept bettors from my country (in their terms they forbid betting from US, UK).
https://i.imgur.com/XQqfQew.png
On Sportsbet.io you can also bet on the party that will win in a particular state if you're interested.
Edit: how do you find this market on sportsbet.io - I can't find any politics betting even using search.
Also do they allow betting in BTC to win BTC or is it converted into local currency?