[QUOTE=Polycarp]
And argument can be made that the Equal Protection Clause governs any case, nationally, relating to same sex marriage, in that if marriage is a fundamental right, and further with the unencumbered adult partner of one’s choice, to restrict it to an opposite sex partner is to impose a distinction impermissible under strict scrutiny on the grounds of sexual orientation. At present, this is purely arguable; SCOTUS has not ruled on it.
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I don’t believe that sexual orientation has been made a suspect class. However, gender has, IIRC, been granted the level of intermediate scrutiny. That is, The government must show that gender discrimination serves an important state interest and that the classification is at least substantially related to serving that interest.
So, we have an equal protection challenge on gender grounds. In other words, if a man can marry a woman, why can’t a woman marry a woman? To infringe on this equal treatment under the law, the legislature must show that it is preserving an important state interest, and that the law is substantially related to this interest.
What, then, is the important state interest? Lots of times, there is the old standby, think of the children. However, as studies come out that show that children raised in same-sex families are just as well adjusted as mixed-gender families, the state’s interest in protecting child welfare becomes a non-issue.
Failing that, the government could present an economic argument (I’m stretching a bit for a second point, so bear with me). Allowing same-sex couples to marry deprives the state of tax revenue generated by people filing income tax returns singly. In such a case, the rebuttal could be that gender discrimination regarding marriage is not substantially related to serving the government’s tax collecting interest.
So, there is an equal protection argument for allowing gay marriage. I believe that, as society changes its understanding of homosexuality (such that we are spared the claptrap about its perversity and instead begin to accept it is occupying a natural place in the diversity spectrum), this argument will gain traction.