Two types of battles proceed at the same time in United States: one at a federal level and another in the states.
Currently, it's not time to make a decision for the Supreme Court yet. It is necessary to wait on March 26th to know if this one will repeal, on the one hand, prop. 8 in California and then to know what it will decide, on the other hand, concerning the cases against DOMA that the court chose to hear.
On another side, the battle for a total equality continues in American states.
Today, one learns from an anonymous senior administration official that Solicitor General Donald Verrilli was consulting with the White House on the Supreme Court's decision but the administration seems not to have made a choice yet...
Recently, Obama said that his administration was working to bring equal rights between LGBT and straight people.
In this case, of course, he won't directly act on the decision of the Supreme Court but he can decide, he and his administration, to tip the scales for equality and so, for the reversal of Proposition 8.
The administration's decision has to be made before February 28th.