And joins the civil rights movement fully:

I understand that even those who oppose discrimination might continue to find it hard to re-think the definition of marriage they grew up with. I know it was for me.

But many of the things we must do to make our union more perfect – whether it’s fighting for decades to reform our health care system or struggling with a difficult moral question – are hard. They take time. And they require that, when you come to realize that something is right, you be unafraid to stand up and say it.

That’s the only way our history will progress along that long arc towards justice.