No matter how much you've done, or how successful you've been, there's always more to do, always more to learn, and always more to achieve.

The ability of Republican leaders to rile up their base - helped along by folks like Rush Limbaugh, some commentators on Fox News - I think created an environment in which Republican voters would punish Republicans for cooperating with me. That hothouse of back-and-forth argument and - and really sharp partisanship I think has been harmful to America.

At the constitutional level, what we of course have assured is that women have the ability to make these reproductive decisions up to the point of viability.

Any fool can have a child. That doesn't make you a father. It's the courage to raise a child that makes you a father.

What the Paris agreement now does is say to China and India and other countries that are potentially polluting, come on board. Let's work together so you guys do the same thing.

I think that part of my optimism comes from the belief that we as a people could actually, regardless of all the disadvantage of the past, regardless of the fact that a lot of other folks got a head start in the race, if we were able to make the race fair right now.

My question would be whether there is active persecution of atheists.