Wrong.What was the basis of discimination in anti-miscegenation statutes? On the basis of race. What is the basis of discrimination on gay marriage?
Last I checked such laws in the past were written based on the racial composition of the couple. These laws are written in terms of the gender composition of the couple (i.e. one man and one woman).
Race is a biological factor, gender is a biological factor.
The basis of discrimination, technically as a function of law, is gender.
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Women can get married
Men can get married.
Ergo no discrimination whatsoever.