David Link has a must-read. Money quote:
I think the administration is trying to get the first rulings on DOMA focused on (a) Section 3 and (b) how it applies to states that have already adopted full marriage rights. Section 3 just applies to the federal government, and says it can only recognize opposite sex marriages. Courts generally shouldn’t reach out for issues — and particularly constitutional issues — that go further than are required to actually decide the particular case before them. So a court, and particularly the Supreme Court, could heed the government’s lead, and decide only those two issues — Is Section 3 constitutional with respect to the federal government as it applies to a couple who are legally married under a state’s law?