The most powerful political moments for me come when I feel like my actions are aligned with a certain truth. I can feel it. When I'm talking to a group and I'm saying something truthful, I can feel a power that comes out of those statements that is different than when I'm just being glib or clever.

The path of America's development is never a straight line. Sometimes we move in ways that are forwards; sometime that seem back.

I think that to the extent that we focus on problems where we can build a moral and a political consensus, then I think that we move the country forward and when we are divided and our politics is focused on dividing, then I think we're less successful, not just from the perspective of the Democratic Party or the Republican Party but from the perspective of the nation as a whole.

Justice needs to be served, what I think people of Baltimore want more than anything else is the truth. That's what people around the country expect.

Iran has to live up to its international obligations. . . . The president has said that our patience is not unlimited.

Issues are never simple. One thing I'm proud of is that very rarely will you hear me simplify the issues.

Part of what's unique about climate change, though, is the nature of some of the opposition to action. It's pretty rare that you'll encounter somebody who says the problem you're trying to solve simply doesn't exist. When President Kennedy set us on a course for the moon, there were a number of people who made a serious case that it wouldn't be worth it; it was going to be too expensive, it was going to be too hard, it would take too long. But nobody ignored the science. I don't remember anybody saying that the moon wasn't there or that it was made of cheese.