I'll say the same thing here I said the first time someone brought up AS's increasingly unpleasant web site: I stopped reading him way before this gay marriage thing started up, for one simple reason: He's an elitist pontificator, not a blogger. He refuses to answer email unless you are yourself part of the media establishment or one of the single biggest names in blogging, and he refuses to correct even the most blatant errors on his site unless he's embarrassed into doing so by one of those same "A-List" bloggers. He's the utter antithesis of what blogging is supposed to be about; he even CHARGES for access to his supposed "best" writing.
If I want to read one-way, pompous treatises issued from On High, written by snobs who expect their readers to just shut up and consume, then I can get that in spades from Newsweek or The New York Times or any of a million other newspapers and magazines. I sure as hell don't need more of it from Andrew Sullivan.
That has been my experience as well -- at most one gets a two or three word flippant response to email, but usually nothing.