Interesting. I'm surprised that no one has mentioned how not too long ago it was illegal (yes, illegal) for a white woman and black man to be married. And remember there was a time when women weren't allowed to vote nor were blacks "human". Heck, it was only a few years ago when a woman living with a guy but not getting married was a "slut". My SO (common-law) is of chinese decent. If this was the turn of the 20th century, I'd hate to imagine what things would be said (not that I'd really care what the old biddies down the street said anyways).
I can't help but see some similarities in this. IMHO (and for what it's worth), I don't think that gay marriages will make marriage more sanctified or less sanctified. Regardless of who the "lovebirds" are, it is love that makes it sanctified. Not a church. Not a religion. Love. Period.
Now on the question of the sanctity of marriage, how about this: an amendment that makes it against the law to abuse your partner. Spousal/partner abuse is still not fully recognized and requires the victim to press charges. Personally, I think that threatens the sanctity of marriage far more than a couple of queers showing they care for each other. How about proving you can financially support someone else? Or that you don't have addiction that could harm someone else?
Anyways, I'm perhaps rambling but in the grand scheme of things, I think there are far more pressing issues than this. People bemoan all that's wrong in the world and sit and point the finger at others but forget that the most powerful and moving thing that will hold things true is themselves.
*shrug*
