We should never hesitate to use military force, and I will not, as president, in order to keep the American people safe. But we have to use our military wisely. And we did not use our military wisely in Iraq.

Our government shouldn't make promises we cannot keep, but we must keep the promises we've already made.

I remember having meetings with Republican senators who initially had been trying to engage [Obamacare] but saw that the politics of 'no' were growing inside the Republican Party.

In sectors like energy, I haven't been arguing for more spending per se; I've been arguing that it doesn't make sense for us to spend $4 billion subsidizing an oil industry that's mature and very profitable. We should be using that money to finance clean energy of the future.

We have to deal with issues like inequality, we have deal with issues of economic dislocation, we have to deal with peoples fears that their children won't do as well as they have. The more aggressively and effectively we deal with those issues, the less those fears may channel themselves into counter-productive approaches that pit people against each other.

Fourth, we will continue providing humanitarian assistance to innocent civilians who have been displaced by this terrorist organization. This includes Sunni and Shia Muslims who are at grave risk, as well as tens of thousands of Christians and other religious minorities. We cannot allow these communities to be driven from their ancient homelands.

If John McCain wants to have a debate about who has the temperament, and judgment, to serve as the next Commander-in-Chief, that's a debate I'm ready to have.