I think a revolution transitioning from fossil fuels to clean, renewable energy - somebody's going to be the 21st-century clean-energy superpower.

When I talk about how we're going to pay for education, how we're going to invest in infrastructure, how we're going to get the cost of prescription drugs down, and a lot of the other issues that people talk to me about all the time, I've made it very clear we are going where the money is. We are going to ask the wealthy and corporations to pay their fair share.

Barack Obama is an incredibly intelligent, thoughtful, decisive person in pursuing the agenda he sets.

The difference between a politician and a statesman is that a politician thinks about the next election while the statesman think about the next generation

Now I know that Wal-Mart's policies do not reflect the best way of doing business and the values that I think are important in America.

I have said the invasion of Iraq was a mistake. But I think if we're ever going to really tackle the problems posed by jihadi extreme terrorism, we need to understand it and realize that it has antecedents to what happened in Iraq and we have to continue to be vigilant about it.

The present system is unsustainable. The only question is whether we will master the change or it will master us.