The kind of violence, looting, destruction that we saw from a handful of individuals in Baltimore, there's no excuse for that. That's not a statement. That's not politics. That's not activism. That's just criminal behavior.

I think my most important advice is to understand what are the foundations of a healthy democracy and how we have to engage in citizenship continuously, not just when something upsets us; not just when there's an election or when an issue pops up for a few weeks. It's hard work.

On the spectrum of successful politicians, I'm not introverted the way some have been.

That is the American story. People, just like you, following their passions, determined to meet the times on their own terms. They weren't doing it for the money. Their titles weren't fancy. But they changed the course of history and so can you.

Insurance companies, drug companies are going to have to be ponying up, partly because right now they're receiving huge subsidies.

This is the moment when we must come together to save this planet.

I believe in term limits for presidents because I think that there is no doubt I'm a better president now than I was when I start.