The Internet and Twitter and all these things are very powerful, but it also means sometimes that instead of having a dialogue we just start calling folks - calling each other names. And that's true on the left or the right.

I think the Greek people, although it is difficult and challenging and the politics of it I know are not good, should appreciate the fact that in this global economy, the Greek economy was going to have to go through some structural reforms.

No, you can't deny women their basic rights and pretend it's about your 'religious freedom'. If you don't like birth control, don't use it. Religious freedom doesn't mean you can force others to live by your own beliefs.

I've just concluded that for me personally it is important for me to go ahead and affirm that I think same-sex couples should be able to get married.

Get involved in an issue that you're passionate about. It almost doesn't matter what it is ... We give too much of our power away, to the professional politicians, to the lobbyists, to cynicism. And our democracy suffers as a result.

And yes, my plan will continue to reduce the carbon pollution that is heating our planet - because climate change is not a hoax. More droughts and floods and wildfires are not a joke. They're a threat to our children's future. And in this election, you can do something about it.

What is required of us now is a new era of responsibility - a recognition, on the part of every American, that we have duties to ourselves, our nation, and the world, duties that we do not grudgingly accept but rather seize gladly, firm in the knowledge that there is nothing so satisfying to the spirit, so defining of our character, than giving our all to a difficult task. This is the price and the promise of citizenship.