Maybe I'm missing something here. But Article IV of the US Constitution says:
Article IV
Section 1. Full faith and credit shall be given in each state to the public acts, records, and judicial proceedings of every other state. And the Congress may by general laws prescribe the manner in which such acts, records, and proceedings shall be proved, and the effect thereof.
Section 2. The citizens of each state shall be entitled to all privileges and immunities of citizens in the several states.
So, let's say come June a gay couple, from, oh, say, Colorado goes to Massachussets and gets married. Colorado has a variation of the DOMA act. Once they come home it seems to me they could sue for full marital rights in Federal Court under Article IV, not to mention the 14th Amendment.
Since gay marriage will be legal in Mass by then, wouldn't the court HAVE to overturn DOMA? Granted they could run into a Republican judge, but there are lots of solid Democrat Federal judges here as well.
Anybody?