In politics you learn to always smile.

The pace of global warming is accelerating and the scale of the impact is devastating. The time for action is limited - we are approaching a tipping point beyond which the opportunity to reverse the damage of CO2 emissions will disappear.

President Obama is doing the right thing by offering young immigrants, most often in this country through no action of their own, a chance to live and work openly, free from the fear of deportation.

I apologize to the public, whom I promised better.

The world has conducted a massive macro-economic experiment since the cataclysm of 2008. In Europe, the fans of austerity have had their chance, and the results have been a disaster.

Some say that I should settle down, go slower and not push so hard, so quickly for such transformational change. To them, I say that you misunderstand the size of the problems we face, the strength of the status quo and the urgency of the people's desire for change.

The Occupy movement needs an organizing principle, and - just as the Tea Party did - it needs some actual measures of success. Choose one candidate whose agenda is squarely within that of the movement and make his or her electoral success a focal point.