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 actually genuinely optimistic about the United States and what's possible in the United States. And when you're out here, you see Americans across racial and economic and socioeconomic lines working together. And you maybe get a little bit less cynical than when you sit in the seat of kind of the epicenter of it all.

Richard Clarke had plenty of opportunities to tell us, in the administration, that he thought the war on terrorism was moving in the wrong direction and he chose not to.

I think America is still a bright, shining city on the hill - not because we're perfect but because we struggle in our imperfections every day.

Our work has only begun. In our time we have an historic opportunity to shape a global balance of power that favors freedom and that will therefore deepen and extend the peace. And I use the word power broadly, because even more important than military and indeed economic power is the power of ideas, the power of compassion, and the power of hope.

I certainly have no regrets about overthrowing Saddam Hussein. I'd do it again. And, yes, there are a lot of things that I think we'd all do differently. Maybe we made some erroneous assumptions about the fabric of the society in Iraq and about the solidity of some of the institutions. And yes, there are a lot of things I would do differently. I'd probably work to rebuild Iraq from the outside in, rather than concentrating so much on Baghdad, for instance.

It was actually fun to write [memoir], because I went back to interview people my parents had taught or who had worked with them, and I learned a lot about them that I hadn't known.