What I'm thinking about are the millions of people, many of whom write me very personal letters :"Dear Mr. President: I did not vote for you. I was against Obamacare. And then my son who didn't have health insurance signed up and we just found out that he had an illness. And thankfully he's now covered, otherwise he might not have gotten treatment and I might have lost my house."

We need more responsibility, but we need it not just when there's a crisis. I mean, we've had years in which the reigning economic ideology has been what's good for Wall Street, but not what's good for Main Street.

When Michelle and I decided that I would run for President, it was because of a shared belief in the power of community and connection, a commitment to the idea that we are our brothers' keepers.

And I will do everything that I can as long as I am President of the United States to remind the American people that we are one nation under God, and we may call that God different names but we remain one nation.

For America to get more entangled militarily in Syria is a serious step, and we have to do so making absolutely certain that we know who we are helping; that we're not putting arms in the hands of folks who eventually could turn them against us or allies in the region.

What we've seen at least since 1979 is Iran making constant, calculated decisions that allow it to preserve the regime, to expand their influence where they can, to be opportunistic, to create what they view as hedges against potential Israeli attack in the form of Hezbollah and other proxies in the region.

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