All the old rules - if you say some crazy stuff you get your show canceled or you get your campaign ended - don't apply in the world of social media. They don't apply in the world of reality TV.

There's no higher honor, in my estimation, than being asked to serve in the White House.

Americans need to see people who are honestly trying to learn from each other, even as we make our own points powerfully and fight for our own values and policies.

I've never launched any initiative or campaign that people thought was a slam dunk.

If we do nothing, the ensuing climate catastrophe will wreck our economy - including wreaking havoc on our food production systems. All credible scientists agree on this point.

Government-mandated and -subsidized ethanol from corn will go down in history as the "Iraq War" of environmental solutions: ill-considered, costly, and disastrous.

The prospects of green economic opportunity is going to be determined to a great extent by politicians arriving at some sort of bi-partisan resolution.