Sorry for the lateness of the response. I don't read the Common Man as often as I should. Without comment on either, it occurs to me that the argument in favor of gay marriage is identical to the argument in favor of polygamy. Does the Common Man draw the line anywhere on the consenting adults union continuum? Yes I appreciate the irony that most polygamists are against gay marriage. :)
Your tardiness is excused, Erasmus, provided you are dutiful in checking in in the future. Dissent here is welcome, and The Common Man appreciates your input.
That said, you're comparing apples to oranges. Indeed, the argument for polygamy is typically a numbers-based dispute, while the gay marriage issue is simply one of fairness and equal opportunity. Even if you believe in polygamy, you can be married to the person you choose (just not to more than one person). If you are gay, however, you cannot.
Also, Erasmus, Prop 8 was an action of the state and people of California. This is significant because when a state hands out rights, it cannot (or at least should not) selectively deny them for specific subgroups of people. It's not "Congress shall establish no law prohibiting the freedom of speech except for left-handed people, who should just shut the Hell up and be grateful that they get scissors and notebooks that cater to their backwards ways." The promise of America is that everyone should have the same basic opportunities, and that what they do with those opportunities is up to them. California, and those who oppose gay marriage deny opportunity to a category of humanity, and that's not right.
The Common Man does draw the line on the consenting adults continuity, Erasmus. Be clear, the problem with polygamy in this country (and around the world) is that it has led to an exploitive and predatory patriarchy that has abused and neglected women and kept them in perpetual servitude. And it has, in its insane and out of control need for more brides, resorted to preying on young girls to fill that need. So it is in the government's interest, and the public's, to make sure that half of its citizens aren't subjected to the lunacy of the Warren Jeffs compounds.
In general, however, The Common Man believes that legality should have little to do with spirituality. If, a la Big Love, three women want to live with one man who is committed to supporting them all and raising their kids, that's ultimately not The Common Man's business (so long as the women aren't being exploited; there's a difference between being a polygamist and being an asshole), anymore than it's The Common Man's business that a young boy lives at home with his mother, father, sister, Uncle Fester, Grandpa Munster, Aunt Clara, and mom's best friend from high school who just left her husband and needs a place to stay for a while.
In fact, The Common Man knows some de facto polygamists (though not actually married, as far as he knows), who he finds intelligent, self-assured, and generally pleasant (and who did not have, nor want, any children). Weird people, very very weird, but kind. The Common Man may not like it, may not agree with it, and may generally find it perplexing (The Common Man has enough trouble catering to the whims of one wife, thank you), but it's ultimately not his place to get angry about it. They are all happy and their arrangement in no way interferes with the sanctity and efficacy of his own marriage. In the same way that allowing gay people to marry one another has absolutely no effect on The Common Man's marriage to The Uncommon Wife.