They're not entirely analogous, to be sure. But if refusing to allow a gay couple to marry is not a form of discrimination, as several people have argued, then banning interracial marriage isn't either. Under the latter, everybody's entitled to marry someone within their own racial grouping but not from outside. I.E. whites can only marry whites, blacks can only marry blacks and so on.
Except that homosexuality doesn't fall into the same catagory as polyginy or polyandry. Homosexuality is a sexual orientation, just like heterosexuality is, while being partial to group love isn't. Homosexuality has been convincingly shown to be biologically determined- a fairly large part of the population quite simply is homosexual. Also the changes required in legislation, fiscal regulations and whatnot to make gay marriage possible are minimal; while the same can't be said for polyamorous groupings.
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