(You may be asking yourself.)
By finally acknowledging that the Defense of Marriage Act is unconstitutional and by refusing to continue to defend challenges against the law in courts.
As quoted in an article on NPR, the new Attorney General Eric Holder released a press statement today stating that President Obama's position is that DOMA is "unnecessary and unfair."
It took two years for this to happen, and it's still a mystery as to why the administration felt the need to defend the law in the first place, but at least the federal government is no longer protecting DOMA.
Hooray for movement toward equality!