Yeah, sure, I support it. If they want to get married, let them. It makes them happy, it doesn't affect me, so why not let them get married?
There are only three reasons why anyone would oppose gay marriage:
1) If they find gays "icky" - which in that case, they're like schoolkids and they have no other reason. Yeah, you might find gay people "icky", but so what? Leave them alone if you don't like them. And part of leaving them alone is letting them get married if they want. Them being married doesn't affect you
2) God says it's not right - well, let him sort it out, hm? If you say this god doesn't like it, and he's all powerful, then why don't you let him stop it? If there is a god (and I don't know if there is or isn't) I doubt two dudes or two gals getting married is going to hurt him. God, if he exists, supposedly created the universe. You don't need to defend him. If he exists, he's perfectly capable of defending himself, and believe it or not, you don't need to fight for him. He's supposedly invincible. Why would you fight for him? He doesn't need fighting for. If god hates it, then that is a conflict between the gays and god, and frankly, you don't need to get involved
3) It'll make my kids gay! - No. It won't. I have had gay friends. I have been around gay people. I am not gay. I didn't need to be taught to hate gays to not be gay - I never could be gay. Sexual orientation is something that is mostly biological. Gay people had something slightly funny happen in their brain when they were developing in the womb and they feel sexual attraction for people of the same gender - it's a neurological phenomenon. You know how I know this? Animals can be gay! And animals don't have culture! Go do research on this topic - there are gay monkeys. Gay deer. Gay lemurs. They exist. And it had nothing, absolutely NOTHING to do with culture, since lemurs don't have culture.
Neural development is startlingly complex to anyone who has ever studied it. The process of brain development is very tricky, and brain "systems" governing complex behaviors like sexual attraction (and believe me, these behaviors are, on a computational and neurological level, VERY complex - just try programming a computer to be attracted to women) are also very complex. In my opinion, when gay people were developing in the womb, something went slightly awry - a neuron here, a synapse there, something went right instead of left, up instead of down, sideways instead of forward, and they were born with an unusual attraction to people of the same gender.
Gay people have existed since the species has existed. Even in cultures which harshly, HARSHLY punish gay people or any expression of gay culture, gays exist, and have maintained a stable population of around 1~3% of the population. Gays never grow above that number (and no, the "10% of people are gay" stat is a myth. It's closer to 1 to 3%). Being gay offers no political, economic, cultural or reproductive benefit. In societies like Iran, you'd have to be INSANE to "choose" to be gay, given the punishment you face if you are. But gay people exist in Iran - despite what Ahmadinejad says - and they are persecuted. G
Gay people are born that way - I'm not saying it is necessarily genetic (although I believe it might be), but I am saying it is neurological and brain-based, not culturally based. They are gay, and that's who they are. So you don't have to worry about gay marriage turning little jimmy gay (not that there's anything wrong with that), because little jimmy is either already gay or will never be gay, and nothing you can do as a parent will or could change that.
There's no logical reason to oppose gay marriage, unless you hate them viscerally for some reason, which in that case, I pity you for feeling such hatred against those who have done nothing to you. Hatred is a poisonous emotion that hurts the one who is feeling it, just as much as the one it is directed against. It must be sad to be so full of hate, day in day out.
Let em get married. It'll make them happy, and I go nothing against those who want to be happy.