but I can't find it now. There is a published study out there which is a long look at the organized anti-gay marriage effort: a long, comprehensive look at what these folks have been telling each other and arguing and using as propaganda.
The finding of the study, to the best of my recall, is that (1), the construction of the Biblical justification is pretty awkward at best, as for all anti-gay dogmatizing, and the stronger authority in political practice amounts to "tradition". But the crux of the matter lies in (2), the literature uniformly projects an image of extremely dysfunctional family life on gay couples and their children, along with a theory that gay people are somehow- by appearing in the media and in suburbia- exposing 'traditional' families to 'values' that are leading to a broad breakdown of "family values". The greatest intensity of the literature in emphasizing this is in the Bible Belt, where divorce rates, spousal abuse issues, moving in together before marriage, premarital sex, and other indicators are highest and perhaps starting to crest.
The conclusion of the study: gay people and gay marriage are being scapegoated for the breakdown of "family values" (read: patriarchal families) by American conservatives and reactionaries in the 'Heartland', which they had previously imagined to be a phenomenon or pathology only of the liberal Coasts.
The true relationship is, of course, correlation: gay people are more visible where people are more Modern, and where people are relatively Modern (aka socially liberal) the patriarchal family goes into breakdown. Any honest family counselling person knows this, but the grieving process for the patriarchal family means the classical Kubler-Ross stages of it- denial, bargaining, bitterness/anger, depression and so on. The anger and denial and sense of violated vanity and resentment at loss of power involved is politically very exploitable, easily harnessed by finding someone who can be argued to be to blame. And gay people are the very visible messengers of social change.
The breakdown of patriarchal family life in the Blue States came earlier- where I am, in New England, the epidemic of divorces and such that is now at something of a peak in the Bible Belt happened here in the late 1970s and early 1980s. People here lashed out against "women's lib" and the feminists with high public profile.
This is a picture of the present condition-
http://obsidianwings.blogs.com/obsidian_wings/2004/11/when_the_blue_s.html