Shock as politician is exposed as cynical bastard.
I'm very pleasantly surprised. Lots of gay Democrats like to assume that people like Hillary Clinton, John Kerry, and Barack Obama are secretly on our side but have to oppose gay marriage publicly because of the political implications. We never have proof of their good intentions--it's wishful thinking leavened with projection. In truth, we have no good reason to think that either Clinton or Kerry truly support gay marriage, especially since it emerged as an issue after their political careers were well along and they could convince themselves they opposed it for moral reasons.
To have Obama exposed as a secret liberal on this issue is very rewarding. It confirms something a lot of people want to believe, even if it doesn't mean he'll do anything about it.