What can gay marriage proponants learn from social conservatives?

A lot, according to Gay Patriot. For example, he points to a study done by "The Gay and Lesbian Medical Association" (who knew such an organization existed?) which indicates that same-sex couples lead longer and happier lives.

More advocates of gay marriage should do as the authors of this report have done–and consider the social conservative defense of traditional marriage. Kudos to them for treating gay marriage as more than a gimmick in the campaign for “equality,” but instead as an meaningful institution which benefits those who undertake its obligations.

I agree. The benefits of a traditional, stable, long term marriage are too immense to count. I cannot imagine that they would not be similar for homosexual couples in similar relationships.