For the Democrats, they're trying to avoid having the Sanders-Clinton debate over and over again. But, to some degree, they're sentenced to that debate. Clinton is much more embracing of the global economy and the international world order. Sanders and Warren are much less so. And they have got to figure out which side the party is on, if they're going to have a clear message. I think this is probably one you probably can't straddle.

I do not believe that anything like what Donald Trump just proposed is going to get through Congress. Those deductions have a lot of defenders. The idea that they're going to completely explode the deficit is just a party killer for the Republican parties.

I think Barack Obama's foreign policy will be regarded more failure than success.

Empathy makes you more aware of other people's suffering, but it's not clear it actually motivates you to take moral action or prevents you from taking immoral action.

Sometime over the past generation we became less likely to object to something because it is immoral and more likely to object to something because it is unhealthy or unsafe. So smoking is now a worse evil than six of the Ten Commandments, and the word sinful is most commonly associated with chocolate.

The point of being a teacher is to do more than impart facts, it's to shape the way students perceive the world, to help a student absorb the rules of a discipline. The teachers who do that get remembered.

I generally think debates within a party should not be treated as a scandal. They should be treated as a sign of strength, to be honest.