I forget where he said it but he said in a press conference not terribly long ago that he doesn't get involved in it at all. So I think it'd be best - if you really care - to assume nothing either way
as for liking Colbert, my dad does too, and he's very conservative so I dunno if that means much
Plus Andy's buddies with Bush Sr and Mattress Mack and is from the midwest. Yes he's from Texas, but Austin is liberal as far as Texas goes. He also makes a lot of money and super rich people tend to be conservative - at least fiscally.
So I really think it's impossible to say. Can't really assume a person's political leanings unless they say so themselves. So I think that'd be the safest thing to do about Andy
If I had to guess, I'd guess he leans Republican, but it's just a guess and I wouldn't say it with any confidence whatsoever