Uh, I'm pretty sure the Supreme Court could overturn the MPA, and thusly become able to overturn the DOMA. As long as someone keeps appealing decisions, it will make it to the Supreme Court.
DOMA is in and of itself ridiculous, because of the Full Faith and Credit clause, Article IV, Section 1 of the Constitution, which states,
Quote:
| Full Faith and Credit shall be given in each State to the public Acts, Records, and judicial Proceedings of every other State. |
DOMA is thusly blatantly unconstitutional, as is the MPA.