Yes, we did. Finally, President Obama can use those words. The passage of health care reform provided the first piece of incontestable evidence that Washington has changed. Congress is, indeed, capable of carrying through fundamental social reform. No longer will the United States be the outlier among wealthy nations in leaving so many of its citizens without basic health coverage. In approving the most sweeping piece of social legislation since the mid-1960s, Democrats proved that they can govern, even under challenging circumstances and in the face of significant internal divisions. To understand how large a victory this is, consider what...