A year ago this week, Capitol Hill was full of noise as the House of Representatives debated, and then voted, on the Affordable Care Act. But one of the most vivid memories of that experience for me was an extended moment of silence.

It came very late on Sunday evening--after the floor speeches, the votes, and the press conferences had ended. The galleries had long since emptied and the Capitol building itself was virtually unoccupied, so that it was possible to walk the entire length of the building, on the ground floor hallway that stretches from the House all the way to the Senate, without hearing so much as a single conversation.

It felt more than silent. It felt peaceful and, yes, satisfying. A prolonged, difficult debate had finally ended. It was time to move on.

Except that we haven’t moved on. We are still having arguments about health care reform. In fact, we are still having the same arguments about health care reform. The Affordable Care Act is law of the land now, yes, but its critics are determined to change that. And while the prospects of repealing it legislatively remain relatively slim, the prospects of repealing at least part of it judicially seem far more realistic than they did in the spring of 2010.

So perhaps it is worth taking a step back, just for a moment, and remembering how we got to this point--why this debate started in the first place and why it led to the enactment of this law.