Let's make two things clear: Isil is not "Islamic." No religion condones the killing of innocents, and the vast majority of Isil's victims have been Muslim. And Isil is certainly not a state.

What is important is that we make sure to work together, that we understand our strength comes from unity and not division.

If we choose only to expose ourselves to opinions and viewpoints that are in line to our own, we become more polarized, more set in our own ways. It will only reinforce and deepen the political divides in our country. But if we choose to actively seek out information that challenges our assumptions and beliefs, perhaps we can begin to understand where the people who disagree with us are coming from.

Because of the internet and communications, the clash of cultures is much more direct. People feel, I think, less certain about their identity, less certain about economic security.

The President does not have power under the Constitution to unilaterally authorize a military attack in a situation that does not involve stopping an actual or imminent threat to the nation.

I was pretty realistic to people about what we could get done, and the situation we were in, and trying to tamp down expectations. If you listen to my stump speeches, if you listen to what I said at Grant Park, I kept on saying, "Look, this is not just about me, this is not going to happen in one year, or one term, or even one presidency." And we tried to layer into everything we were saying a sense of hope, but also realism.

And I do not want, and I will not accept, a deal in which I am asked to do nothing, in fact, I'm able to keep hundreds of thousands of dollars in additional income that I don't need, while a parent out there who is struggling to figure out how to send their kid to college suddenly finds that they've got a couple thousand dollars less in grants or student loans.