I realize I'm jumping ahead here, but since we're starting over with topic, I want to touch on some other things about gay marriage. Pre-emptive strike, if you will.
One of the arguments I've heard used against the legalization of gay marriage is that if homosexuality is legalized, it will open a Pandora's box of sorts, and will inevitably lead to the legalization of pedophilia, bestiality, etc. While I definitely don't find any comparison of homosexuality and pedophilia/bestiality to be apt, I do think it is a well-intended concern.
My belief on marriage is that any two consenting adults who wish to be married, should. That, in my mind, should be absolute, therefore excluding a person from marrying underage kids or animals(or your right hand, the example I believe DaveWTB used).