Black children, white children, Latino children. America is becoming more diverse, it's becoming more tolerant as a consequence there's more interactions between groups. There are going be tensions that arise.

Obama said if elected his government would "harness technology to confront the biggest challenges that America faces".

Progress in the most impoverished parts of our world enriches us all.

But shouldn't we also quit marketing murder as a game?

It's easier to make negative attacks and simplistic slogans [in social media] than it is to communicate complex policies.

Every three weeks, we bring online as much solar power as we did in all of 2008.

We can't have special interests sitting shotgun. We gotta have middle class families up in front. We don't mind the Republicans joining us. They can come for the ride, but they gotta sit in back.