I worry very much about kids growing up in a society where they think: "I'm not going to talk about this issue, read this book or explore this idea because someone may think I'm a terrorist." That's not the kind of free society I want for our children.

The billionaire class fully understands what is at stake. That's why a handful of them are pouring hundreds of millions of dollars into the current elections. Their goal is not to strengthen the middle class, but continue the trend in which the rich are getting richer at the expense of everyone else.

Fifty years ago, great schools like the University of California and the City University of New York - as well as many state colleges - were tuition free. Today college is unaffordable for many working class families. For the sake of our economy and millions of Americans, we must make higher education more affordable.

The main problem of America is that you're seeing people working all over this country two jobs, they're working three jobs, and they're getting nowhere in a hurry. They're working hard. They can't afford to send their kids to college in many instances. They can't afford child care for their little babies. They're worried to death about retirement.

It means joining with allies to deploy renewable energy technologies -- both at home and around the world -- to confront the very real and present danger of potentially irreversible climate change.

The focus, to my mind, is to make sure that Donald Trump does not become president of the United States. I think by temperament he is unqualified to be president. I think his views - you have a guy who's running for president who rejects science, doesn't even believe climate change is real, let alone wants to do something about it, wants to give hundreds of billions of dollars in tax breaks to the top two-tenths of one percent.

It is a public financing system that everybody knows is antiquated. It no longer works. Nobody can become president based on that system.