For too many of us, it's become safer to retreat into our own bubbles, whether in our neighborhoods or on college campuses, or places of worship or especially our social media feeds, surrounded by people who look like us and share the same political outlook and never challenge our assumptions. And increasingly, we become so secure in our bubbles that we start accepting only information, whether it's true or not, that fits our opinions, instead of basing our opinions on the evidence that is out there.

It's time to recognize that under the equal protection clause of the United States [Constitution], same-sex couples should have the same rights as anybody else.

The trick is figuring out how do we structure government systems that pool resources, and hence facilitate some [wealth] redistribution, because I actually believe in redistribution, at least at a certain level, to make sure that everybody's got a shot.

I make no apologies for us wanting to do this [bombing Iraq and Syria] appropriately and in a way that is consistent with American values.

If you look at Libya, I was deeply concerned about what would happen after Qaddafi was gone.

We have to stand up for these issues when it's tough, and that's what I've done. I did it when I was in the state legislature, sponsoring the Illinois version of the DREAM Act, so that children who were brought here through no fault of their own are able to go to college, because we actually want well-educated kids in our country who are able to succeed and become part of this economy and part of the American dream.

It's a moral imperative, it's an economic imperative, and it is a security imperative. For we've seen how spikes in food prices can plunge millions into poverty, which, in turn, can spark riots that cost lives, and can lead to instability. And this danger will only grow if a surging global population isn't matched by surging food production. So reducing malnutrition and hunger around the world advances international peace and security - and that includes the national security of the United States.