Our sense of optimism, our can-do spirit, that's a source of great strength in America. But when there are no limits at all and we've gone through whole periods where we think everything has gone right, that's when disaster tends to strike.

Foreign policy is a little bit like a guy who goes to Las Vegas. If you win too much, then you eventually bet the mortgage. You start to think you are infallible.

When you talk about the security and safety of average Americans it doesn't do average Americans a lot of good to expand America's military footprint if the daily lives of average Americans are being undermined by the fact that we're no longer able to compete in a global economy. I think that's the kind of human security we have to pay more attention to.

The top line is that hubris is a disease that comes from success.

There are real threats but there's a difference between recognizing real threats and an irrational kind of apocalyptic threat.

I hope Barack Obama puts another woman on the Supreme Court. And this time, I hope it's a woman with kids.

On domestic policy, one of the major stories in American politics has been the growing ideological and political self-confidence of the Democratic Party, and the growing ideological and political pessimism of the Republican Party.