We are reaching a tipping where the pace of settlements, during the course of my presidency has gotten so substantial that it's getting harder and harder to imagine an effective, contiguous Palestinian state. And I think it would have long-term consequences for peace and security in the region, and the United States, because of our investment in the region, and because we care so deeply about Israel, I think has a legitimate interest in saying to a friend, "This is a problem."

The issue of climate change is one that we ignore at our own peril. There may still be disputes about exactly how much we're contributing to the warming of the earth's atmosphere and how much is naturally occurring, but what we can be scientifically certain of is that our continued use of fossil fuels is pushing us to a point of no return. And unless we free ourselves from a dependence on these fossil fuels and chart a new course on energy in this country, we are condemning future generations to global catastrophe.

The challenge there is that ISIL doesn't have an air force, so the damage done there is not against ISIL, it's against the Syrian regime.

At least Romney and McCain, they respect the rule of law. At least Romney and McCain, they understand their limitations.

I think we have two conflicting traditions in this country. I think it's important for us to recognize that we've got a tradition of handgun ownership and gun ownership generally. And a lot of people - law-abiding citizens use if for hunting, for sportsmanship, and for protecting their families. We also have a violence on the streets that is the result of illegal handgun usage. And so I think there is nothing wrong with a community saying we are going to take those illegal handguns off the streets.

[Young people] are showing enormous and entrepreneurship and working with each other across borders.

Presidential elections always turn on personalities, they turn on how campaigns are run, they turn on natural desires for change.