How are they special rights? Not really sure how you can argue that, when the basic human right of being able to marry freely is not available to most homosexuals across America. Why? Because the majority of states don't permit it.
Those who are asexual aren't discriminated against, nor bisexual, pansexual, or all those other random -sexuals out there. Nor are heterosexuals. Even if it is just in one area (which I doubt), the right to marry should not be considered a "special right" when the couple is homosexual.