According to Reuters, the top court of the Cherokee Nation has declined to strike down a marriage between two women performed in May 2004, before tribal law was changed to ban the practice. A lawyer for the tribal council says it's possible the U.S. government will have to recognize the marriage because of the sovereign status of Indian tribes, which could, in theory at least, make them eligible for federal tax benefits denied to date to gay couples.
DOMA (the Defense of Marriage Act) vs. tribal sovereignty. We'll
see how this one plays out.