Thomas Jefferson believed that to preserve the very foundations of our Nation, we would need dramatic change from time to time. Well, my fellow Americans, this is our time. Let us embrace it.

The light may be fading on the 20th century, but the sun is still rising on America.

Because primarily of the power of the Internet, people of modest means can band together and amass vast sums of money that can change the world for some public good if they all agree.

Shakespeare wrote, Einstein thought, Ataturk built.

Nearly every problem has been solved by someone, somewhere. The challenge of the 21st century is to find out what works and scale it up.

I was not elected to produce a pile of vetoes.

Constant conflict is actually often good politics. Because the more you can inflame your supporters the more likely they are to show up at election day. And if they're more inflamed than the other side, even if the other side has more people agreeing with it, you'll win, because your crowd will show up.