Opponents of same-sex marriage worry that allowing two men or two women to wed would radically transform a time-honored institution.

But they’re way too late on that front. Marriage has already been radically transformed – in a way that makes gay marriage not only inevitable, as Vice President Biden described it in an interview late last year, but also quite logical.

We are near the end of a two-stage revolution in the social understanding and legal definition of marriage.

This revolution has overturned the most traditional functions of the institution: to reinforce differences in wealth and power and to establish distinct and unequal roles for men and women under the law.

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