Atheists, do you support same-sex marriage?

[abaris]

Not really a believer in marriage in general, but I 100% support any couple who wants it, gay or straight.

Sure, you don't have to be a believer in marriage to support it, but there are also legal privileges involved when two people are married instead of just living in a relationship. Such as getting full disclosure when your partner is hospitalised and being entitled to inherit. It usually also involves childcare. I say usually, since I don't know the American legislation about adopting and caring for children one or both of the partners brought into the relationship.