WASHINGTON – As the justices of the Supreme Court struggled with the question of same-sex marriage this week, politicians in Congress kept handing down their own verdict. One after another, a series of lawmakers in recent days endorsed allowing gay men and lesbians to wed.

But momentum in the political world for gay rights could actually limit momentum in the legal world. While the court may throw out a federal law defining marriage as the union of a man and a woman, the justices signaled over two days of arguments that they might not feel compelled to intervene further, since the democratic process seems to be playing out on its own, state by state, elected official by elected official.