I've always said as a political scientist that "culture" is what we use when we can't explain things. I think it's more about accessibility. Part of the problem is that this is an expensive game [golf]. I know in a couple of places where there are black members, and they come from pretty much the same socioeconomic level that the white members come from.

We don't want the smoking gun to be a mushroom cloud.

Most of the people who were responsible for 9/11 are now in custody or have been killed. But there are others, and they plot and they plan, and they hope to pull it off again. And while we have to be right 100 percent of the time, they only have to be right once. So there's no way to overreact to that.

I've always said as a political scientist that "culture" is what we use when we can't explain things. I think it's more about accessibility. Part of the problem is that this is an expensive game [golf]. I know in a couple of places where there are black members, and they come from pretty much the same socioeconomic level that the white members come from.

I do have a favorite Zeppelin song, Larry, Black Dog.

I worry a great deal about all of those surveys that are out that Americans, in particular, are becoming distrustful of our institutions - that Americans are beginning to say they're either irrelevant or they're corrupt or they certainly don't speak to me. But the institutions are actually still functioning.

I'm not personally fearful, but I look out, and there are a number of things that concern me, and I'm hopeful that we can overcome them.