Massachusetts, the first state in the nation to legalize gay marriage, has become the first state to challenge the constitutionality of a federal law that defines marriage as the union of a man and a woman, saying Congress intruded into a matter that should be left to individual states.
“In enacting DOMA [the Defense of Marriage Act], Congress overstepped its authority, undermined states’ efforts to recognize marriages between same-sex couples, and codified an animus towards gay and lesbian people,” the state said in a lawsuit filed today in US District Court in Massachusetts.
Many have argued that States have the right to define marriage for themselves and thus outlaw SSM as they wish. It is an interesting tack that if you assume such rights for the states, federal DOMA may be stepping on ground reserved to the states.
UPDATE (by David): You can read the complaint at this link (PDF).