In the campaign back in 2007, 2008, people would say, "Oh, he's being naïve. He thinks that there's no red states and blue states. And wait 'til he gets here." And I will confess that, I didn't fully appreciate the ways in which individual senators or members of Congress now are pushed to the extremes by their voter bases. I did not expect, particularly in the midst of crisis, just how severe that partisanship would be.

I'm suspicious of too much certainty in the pursuit of understanding just because I think people are limited in their understanding.

Inequality also distorts our democracy. It gives an outsized voice to the few who can afford high-priced lobbyists and unlimited campaign contributions, and runs the risk of selling out our democracy to the highest bidder. And it leaves everyone else rightly suspicious that the system in Washington is rigged against them - that our elected representatives aren't looking out for the interests of most Americans.

We will keep the promise of Social Security by taking the responsible steps to strengthen it - not by turning it over to Wall Street.

Both President Kennedy and President Reagan were roundly criticized by parts of the foreign policy establishment that felt they were being weak by engaging our adversaries. So some of it is built into a political lexicon that makes you sound tougher if you don't talk to somebody, and rather, very loudly, wield a big stick.

America must always lead on the world stage. If we don't, no one else will. The military that you have joined is, and always will be, the backbone of that leadership. But U.S. military action cannot be the only - or even primary - component of our leadership in every instance. Just because we have the best hammer does not mean that every problem is a nail.

Stock market risk is ok, but not for Social Security.