Arne Duncan is done more to bring our educational system, sometimes kicking and screaming, into the 21st century than anyone else.

No single nation should pick and choose which nations holds nuclear weapons. And that's why I strongly reaffirmed America's commitment to seek a world in which no nations hold nuclear weapons.

Race remains a potent and often divisive force in our society.

There is a big risk for the Republicans in a race, especially with Hillary Clinton as a likely Democratic nominee in a contest that will focus on the possibility of the first woman president to be six months suspending up the nomination of a black woman, who is imminently qualified.

I didn't have a perfect model, but I wanted to try to blend my own personal reflections and experiences with this broader canvas to see how a lot of the narratives we have about economy and foreign policy got stuck. Because we have these categories of liberal, conservative, free marketer, open government - all these stereotypes about our politics and the categories we try to put things in are inadequate to this sort of complex, ambiguous, sometimes contradictory experience we have as ordinary people and that I have as an elected official.

The Internet didn't get invented on its own. Government research created the Internet so that all the companies could make money off the Internet. The point is, is that when we succeed, we succeed because of our individual initiative, but also because we do things together.

Today, the world lost a creative icon. Michelle and I join millions of fans from around the world in mourning the sudden death of Prince.