It's useful for activists just to be out there to keep you mindful and not get complacent, even if ultimately you think some of their criticism is misguided.

We've got to control our own energy. Now, not only oil and natural gas, which we've been investing in; but also, we've got to make sure we're building the energy source of the future, not just thinking about next year, but ten years from now, 20 years from now. That's why we've invested in solar and wind and biofuels, energy efficient cars.

But today, just a few years into the twenty-first century, we already find ourselves in a different and precarious position. As revolutions in communications and technology have broken down barriers across the world, it has given more power to both our competitors and our enemies.

Over the last 15 months, we've traveled to every corner of the United States. I've now been in 57 states? I think one left to go.

We are one nation under God, and we may call that God different names but we remain one nation.

Because of the internet and communications, the clash of cultures is much more direct. People feel, I think, less certain about their identity, less certain about economic security.

There are certain occupations - probably, most prominently, politics - where there would be a bias against somebody who's agnostic or atheist in running for office.