I do believe, separate and apart from any particular election or movement, that we are going to have to guard against a rise in a crude sort of nationalism or ethnic identity or tribalism that is built around an us and a them.

For the sake of our children and our future, we must do more to combat climate change. Now, it's true that no single event makes a trend. But the fact is the 12 hottest years on record have all come in the last 15. Heat waves, droughts, wildfires, floods-all are now more frequent and more intense. We can choose to believe that Superstorm Sandy, and the most severe drought in decades, and the worst wildfires some states have ever seen were all just a freak coincidence. Or we can choose to believe in the overwhelming judgment of science-and act before it's too late.

We cannot stop every act of senseless violence. We cannot know every evil that lurks in troubled minds. But if we can prevent even one tragedy like this, save even one life, spare other families what these families are going through, surely we've got an obligation to try.

Maybe you could be a great writer - maybe even good enough to write a book or articles in a newspaper - but you might not know it until you write that English paper - that English class paper that's assigned to you.

Obviously I'm grayer, a few more wrinkles. One of the things I'm proud about is that I think my basic character and outlook actually have not changed much. And people who are closest to me will tell you that the guy who came here is the same guy who's leaving.

I want to be very clear: I will not sign on to any health plan that adds to our deficits over the next decade.

Health care costs generally have gone up at a significantly slower rate since ObamaCare was passed than they did before, which has saved the federal Treasury hundreds of billions of dollars.