The fly in the ointment was that nobody bothered to check
whether the Full Faith and Credit Clause had actually ever been read to require one state to recognize another state's marriages. It hasn't. Longstanding precedent from around the country holds that a state need not recognize a marriage entered into in another state with different marriage laws if those laws are contrary to strongly held local public policy. The "public policy doctrine," almost as old as this country's legal system, has been applied to foreign marriages between first cousins, persons too recently divorced, persons of different races, and persons under the age of consent. The granting of a marriage license has always been treated differently than a court award, which is indeed entitled to full interstate recognition. Court judgments are entitled to full faith and credit but historically very little interstate recognition has been given to licenses.
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The assumption that there must be a single national definition of marriage --traditional or open-ended -- is mistaken and pernicious. It is mistaken because the existing constitutional framework has long accommodated differing marriage laws. This is an area where the slogan "states rights" not only works relatively well, but also has traditionally been left to do its job. We are familiar with the problems of integrating different marriage laws because for the last 200 years the issue has been left, fairly successfully, to the states.
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If today's proponents of a marriage amendment are motivated by the fear of some full faith and credit chain-reaction set off in other states by Massachusetts, they needn't be. If they are motivated by the desire to assert political control over what happens inside Massachusetts, they shouldn't be. In our 200-year constitutional history, there has never yet been a federal constitutional amendment designed specifically to reverse a state's interpretation of its own laws. Goodridge, whether decided rightly or wrongly, was decided according to Massachusetts' highest court's view of Massachusetts law. People in other states have no legitimate interest in forcing Massachusetts to reverse itself -- Massachusetts will do that itself, if and when it wants to -- and those who want to try should certainly not cite the Full Faith and Credit clause in rationalizing their attempts.