What Congress does, sometimes it later tries to undo. That's what happened a few days ago, when the Senate Judiciary Committee approved a measure repealing the Defense of Marriage Act, or DOMA.
Under DOMA, the federal government is bound to recognize only those marriages between a man and a woman. When the law passed 15 years ago, not one state recognized same-sex marriage. Six do so now, as well as the District of Columbia. But the effort to overturn DOMA faces stiff resistance from congressional Republicans.