We know what happens when Europeans start dividing themselves up and emphasizing their differences and seeing a competition between various countries in a zero sum way.

We've got to make sure that we rebuild the infrastructure in America, because we used to be - have the best bridges, the best roads, the best airports. And now, when you go to China or you go to Europe, you see that they are outstripping us in terms of infrastructure. And if we put people back to work, that would be good not only in the short term, but it would also lay the foundation, the framework for long-term economic and job growth.

American politics is always somewhat fluid. In this age of social media, it means that voters can swing back and forth.

Let's not play games. I was suggesting - you're absolutely right that John McCain has not talked about my Muslim faith.

What we may think is funny or cute may end up being powerfully hurtful.

She is running around talking about how this is an insult to sportsmen, how she values the Second Amendment. She's talking like she's Annie Oakley.

We now live in a world where the most valuable skill you can sell is knowledge. Revolutions in technology and communication have created an entire economy of high-tech, high-wage jobs that can be located anywhere there's an internet connection. And today, a child in Chicago is not only competing for jobs with one in Boston, but thousands more in Bangalore and Beijing who are being educated longer and better than ever before.