Gay couples should be allowed to marry in the United States. I don't know how anyone can argue otherwise.
Because the concept "marriage" is not compatible with the concept "homosexual."
But likewise polygamous triples should also be allowed to marry in the United States. I don't know how anyone can argue for the former and yet oppose the latter. Polygamous groups tried to get legal sanction for their alternate sexual lifestyle first, so I think they should be granted it first; or at the same time; if a law were formulated that made it legal for two or three adults of any gender combination to be married, I would support that law.
Its rare to see thorough amoralism of this kind expressed to clearly and forthrightly.
Note, though, that I am not saying I want polygamy to come back to the LDS Church. I don't think that will ever happen, and for the record I do not want that to happen. Rather I'm looking for vindication. I want the United States to admit (either explicitly or, by passing said law, implicitly) that it violated the LDS Church's rights by nearly legislating it out of existence for doing the moral equivalent of what gay couples are doing today.
The concept "homosexuality extinguishes the concept "marriage" if they are brought together and any kind of melding is attempted. Homosexual marriage has very little to do with homosexuals actually getting married (very, very few of the overall homosexual population, I predict, will ever avail themselves of the institution regardless) and everything with the final and irrevocable legitimation of homosexuality as equal, in a moral and cultural sense, to heterosexual marriage. Its about a thorough subversion and redefinition of gender, gender roles, and marriage as a concept at the core of civilization.
There are very few acids capable of eating away the foundations of civilization than domesticated, legitimized homosexuality and its culture (another, I would dare say, is postmodernism).