You can't entirely compare between the United States and Greece for a range of reasons, not just because of the size of the economy.

We want everybody to act like adults, quit playing games, realize that it's not just my way or the highway.

Progress does not compel us to settle centuries-long debates about the role of government for all time, but it does require us to act in our time.

If we want America to stay on the cutting edge, we need young Americans to master the tools and technology that will change the way we do just about everything.

One of the things that we have to change in this country is the idea that people can't disagree without challenging each other's character and patriotism. I have never suggested that Sen. McCain picks his positions on national security based on politics or personal ambition. I have not suggested it because I believe that he genuinely wants to serve America's national interest. Now, it's time for him to acknowledge that I want to do the same. Let me be clear: I will let no one question my love of this country.

One of the things I think the next president has to do is to stop fanning people's fears. If we spend all our time feeding the American people fear and conflict and division, then they become fearful and conflicted and divided. And if we feed them hope and we feed them reason and tolerance, then they will become tolerant and reasonable and hopeful.

Those who adhere to the ideology of rejecting Israel’s right to exist, they might as well reject the earth beneath them or the sky above, because Israel is not going anywhere.