We are still a young country, and many of our landmark civil rights decisions are fresh enough that the voices of their champions still echo, even as the world that preceded them becomes less and less familiar. We have yet to celebrate the centennial of the 19th Amendment, but a society that denied women the vote would seem to us now not unusual or old-fashioned but alien. I believe that in 2013 DOMA and opposition to marriage equality are vestiges of just such an unfamiliar society.

Americans have been at this sort of a crossroads often enough to recognize the right path. We understand that, while our laws may at times lag behind our best natures, in the end they catch up to our core values. One hundred fifty years ago, in the midst of the Civil War, President Abraham Lincoln concluded a message to Congress by posing the very question we face today: “It is not ‘Can any of us imagine better?’ but ‘Can we all do better?’ ”

The answer is of course and always yes.