Here are your choices:
Colbert - Strong left lean, constant mocking of traditional values
Meyers - Shriekingly flamingly left, his rants against Trump and the American electorate are insulting
Kimmel - About 70% liberal, but at least attempts to play the middle. Sadly he's pretty boring.
Conan - Registered democrat, contributor and shill. Small audience.
Corden - Would be a hard left lean if the full tilt left of Meyers and Colbert weren't so much further out there. At least he didn't throw a tantrum after the election like so many others did.
Oliver - Asshole.
Noah - Assholier
Then there's Fallon. He's most likely a democrat. But he tries to straddle the fence a little. Like all of the media he gave Obama a pass on almost everything and was harder on Trump than on Clinton.
I'd still rather watch him than the rest. I don't watch any of them, but if I did, it would be Fallon.