The strength of the American political system, it has often been said, rests on what Swedish Nobel Prize-winning economist Gunnar Myrdal called the American Creed: the principles of individual freedom and egalitarianism. Written into our founding documents and repeated in classrooms, speeches, and editorial pages, freedom and equality are self-justifying values. But they are not self-executing. Mutual toleration and institutional forbearance are procedural principles - they tell politicians how to behave, beyond the bounds of law, to make our institutions function. We should regard these procedural values as also sitting at the center of the American Creed - for without them, our democracy would not work.