Teddy Roosevelt supported a progressive income tax. If I am sitting pretty and you've got a waitress who is making minimum wage plus tips, and I can afford it and she can't, what's the big deal for me to say, 'I'm going to pay a little bit more'? That is neighborliness.

We want to see the Iranians engage, and as you know, we have attempted to bring about that engagement over the course of the last three-plus years. It has not proven effective.

On issues like Ukraine, on issues like Syria, we've had very significant differences [with Russia].

There may be no greater tribute to Steve Jobs' success than the fact that much of the world learned of his passing on a device he invented.

I wonder, sometimes, whether men and women in fact are capable of learning from history--whether we progress from one stage to the next in an upward course or whether we just ride the cycles of boom and bust, war and peace, ascent and decline.

Chancellor [Angela] Merkel is perhaps the only leader left among our closest allies that was there when I arrived. So in some ways we are now the veterans of many challenges over the last eight years.

Ultimately peer pressure can lead people to bully, but peer pressure can also say bullying is not acceptable.