I think I'm saying the same thing as Punzy when I say that government should neither condemn nor recognize ANY sort of marriage. It's a religious institution. Government needs to butt out of it.
That is impossible in today's society -- between the tax laws, family rights in a hospital room, real estate purchases, 401k beneficiaries, etc, etc. Marriage is in actuality a government institution, at least in our society, way more than it appears to be a religious institution.
If you want to get down and dirty, I say grant everyone the right to a civil union and all the benefits that marriage currently entails. Then let churches, temples and mosques decide who is "married." Some heterosexual couples would not qualify, and a lot would not want to. IMO.
I think it is an antiquated ideal and I have a feeling it will be abandoned very soon. I think the overall attitudes towards gays and lesbians have changed substantially in the last few years. I'm hoping our government and other closed-minded folks will follow suit.