"The Obama administration's decision to no longer back the Defense of Marriage Act won't immediately enable married gay couples to receive federal benefits, but is already shaping battles in the courts and in Congress that could affect a range of government policies.
"...The move 'will have a very significant impact because it is easier for the courts to say "we think this law is unconstitutional" if another branch is already saying that,' said Jon Davidson, the legal director of Lambda Legal, one of the groups that has challenged the law in court.