In any walk of life, a positive, upbeat outlook trumps any adversarial act. Revenge is counterproductive. Unproductive emotions limit one's ability to move forward, to focus, to think positively, to act creatively.

I respect the president. He and I have a difference of opinion on how to help the country we both love. But the question each of us wants the voters to answer is who will be the better president, not who is the better American.

I'm not competing in Iowa for a reason.

With a weak and rotting core, you don't have much of a foreign policy. You're discounted at the negotiating table, economically and militarily. So when people ask what's the best course of action for the U.S.-China relationship, I can give you ten academic responses. But the reality is we need to rebuild our core.

Science is the process of crash testing ideas: you ram the idea head-on into a brick wall at 60mph, and knowledge is gained by examining the pieces. If the theory is solid, the pieces are from the wall. Then we build a bigger wall.

I'm a true native of the Bay Area.

I think we have to be very sensitive to our need to compete, moving forward, and a lot of that is tied to tax policy.