Entrepreneurs embody the promise of America: the idea that if you have a good idea and are willing to work hard and see it through, you can succeed in this country. And in fulfilling this promise, entrepreneurs also play a critical role in expanding our economy and creating jobs.

What we can be scientifically certain of is that our continued use of fossil fuels is pushing us to a point of no return

We know hackers steal people's identities and infiltrate private e-mails. We know foreign countries and companies swipe our corporate secrets.

I don't buy the hype when everybody is saying how wonderful things are and how great I am, and I don't get too down when people say, "This is a disaster and he's done for."

The biggest challenge, I think, is always maintaining your moral compass.

I don't think [pot] is more dangerous than alcohol.

Health care has become a proxy for a broader set of issues about how much government should be involved in our economy, particularly coming off a huge economic crisis.