Too often, we have failed to enforce international norms when it's inconvenient to do so.

As the world's largest economy and second-largest carbon emitter, as a country with unsurpassed ability to drive innovation and scientific breakthroughs, as the country that people around the world continue to look to in times of crisis, we've got a vital role to play. We can't stand on the sidelines. We've got a unique responsibility.

The trick is figuring out how do we structure government systems that pool resources, and hence facilitate some [wealth] redistribution, because I actually believe in redistribution, at least at a certain level, to make sure that everybody's got a shot.

If you're one of the more than 250 million Americans who already have health insurance, you will keep your health insurance. This law will only make it more secure and more affordable.

If the global economy is unresponsive to people who feel left behind, if inequality continues to grow, then we could end up seeing more and more of these divisions arise throughout advanced economies around the world.

We know the battle ahead will be long. But always remember that, no matter what obstacles stand in our way, nothing can stand in the way of the power of millions of voices calling for change.

If you run you stand a chance of losing, but if you don't run you've already lost.