Fighting climate change isn't just an obligation we owe to future generations. It's also an opportunity to improve public health - and drive economic growth - in the here and now.

Last I looked - and I'm not a candidate - but last time I checked reading about the Constitution, the Electoral College has nothing to do with parties, has absolutely nothing to do with parties. It's most states are winners take all.

You know, Russia today is, what, 200 million people? In land mass, it's probably 50 times the size [of Japan], in natural resources a hundred times the size! Russia's not doing all that badly. The public there - not everybody - but they have things that the West offered, [that] were only available in the West a long time ago.

When you go to Washington now, you can feel a sense of fear in the air - the fear to do anything, or say anything, that might affect the polls, or give the other side an advantage, or offend a special interest.

[Jeb Bush] could, as I describe it, run the railroad.[John] Kasich could run the railroad. Hillary Clinton can run the railroad. Running the railroad is the most important thing. You have got 4 million employees; you've got to make the system work, and it doesn't work very well.

We would betray our values and play into our enemies' hands if we were to treat Muslims differently than anyone else. In fact, to cave to popular sentiment would be to hand a victory to the terrorists, and we should not stand for that.

I think [Winston] Churchill said it was " [democracy] the worst of all systems except for all the others." And that's probably true. It's never gone easily.