I think if you have mandatory carbon caps combined with a trading system, much like we did with sulfur, and if you have a tax-incentive program for investing in the solutions, that there's a package there that's very, very good.

If you have depression, you are dramatically more likely to be sick. Now to say you don't need to treat depression because it's not a medical reality - when in fact it clearly affects your interaction with the entire world around you - is just frankly reactionary.

The most important social welfare program in America is a job.

If we'd had government on [today's] scale in the 1840s, the stagecoaches would have hired lobbyists to get a bill passed that railroads could not travel faster than a horse because it would be an unfair competitive advantage.

If I can get you to a point where you can lead a full life, sustain a job, earn money for your family - you can be completely engaged as a citizen.

And by the way I don't object if people want to attack me, that's their right. All I'm suggesting that it's not going to be very effective and that people are going to get sick of it very fast. And the guys who attacked each other in the debates up to now, every single one of them have lost ground by attacking.

I'm moderately optimistic. We Americans are an enormous country with more than 300 million people so there's reason for optimism.