Here are a couple of useful precedents from the late lamented Miscegenation Era, which our current Strict Constructionists can use today in their continuing efforts to prevent Gay Marriage:
A Georgia court, in ruling against the appeal of an interracial couple attempting to marry, stated that such marriages are “Not only unnatural but always productive of deplorable results", such as increased effeminate behavior in the population. “They are productive of evil, and evil only, without any corresponding good in accordance with the God of nature.”
The state of California once declared that a law preventing blacks and whites from marrying is necessary to prevent “traditional marriage from being contaminated by the recognition of relationships that are physically and mentally inferior and entered into only by the dregs of society.”
When this Georgia court ruled that interracial marriage would produce "increased effeminate behavior in the population", it must have known (one hundred years ago) that decisions prohibiting interracial marriage would one day be used as precedents in Gay Marriage cases.