Justice [Sonia]Sotomayor said, "Let's talk - you want to talk about the tax power."And I got like a 10-minute run on the tax power. And, boy, was I glad I did because I was able to get across this idea that, yes, this is a narrower ground on which you can affirm it. And I think everybody agrees. I think even the dissenting justices ultimately in the case agreed that, if Congress had expressly called it a tax, it would be indisputably constitutional.

Quite often there's a great deal of disagreement within the executive branch about what we should do. Some cases are pretty straightforward, but a lot of them aren't.

I think what Lawrence did was provide an assurance that gay and lesbian couples could live openly in society as free people and start families and raise families and participate fully in their communities without fear. And two things flowed from that, I think. One is that has brought us to the point where we understand now in a way even that we did not fully understand in Lawrence, that gay and lesbian people and gay and lesbian couples are full and equal members of the community.

The president [Barak Obama] had been asked some questions by George Stephanopoulos on a news show about whether it was a tax. And he had given an answer that you might read as him saying it wasn't a tax. I think what he said was, "It isn't a tax increase on all Americans."

I did think Justice [Antony] Kennedy's opinion on Lawrence was critical to that because it really, what Lawrence in one sense was, of course, about consensual sex being something that the government can't regulate. But really in a more fundamental sense, what it was saying, "Look. Gay people are normal people, and they get to live normal lives. They're not criminals by virtue of the fact of being gay."

It's the spring of 2012, that the [Barak] Obama administration would be embracing the argument that the Affordable Care Act was a tax, and that was going to, itself, be a political albatross.

The moot court process in our office when we get ready, we - everybody, including the SG, does two moot courts for each argument. And they are phenomenal, and they predict 90 percent of the questions that I get asked, at least 90 percent.