I'll change the posture of our federal government from being one of the most anti-science administrations in American history to one that embraces science and technology.

I will sign a universal health-care bill into law by the end of my first term as president that will cover every American and cut the cost of a typical family’s premium by up to $2,500 a year.

It is absolutely important that we have a unified alliance and that we explain to the Russians that you cannot be a 21st-century superpower, or power, and act like a 20th-century dictatorship.

Hope -- Hope in the face of difficulty. Hope in the face of uncertainty. The audacity of hope! In the end, that is God’s greatest gift to us...A belief in things not seen. A belief that there are better days ahead.

Non-Islamic, non-foreign-motivated terrorist actions have killed at least as many Americans on American soil as those who were promoted by jihadists. But what we have also seen is ISIL evolve, because of the sophistication of their social media, to a point where they may be inspiring more attacks - even if they're self-initiated, even if they don't involve complex planning - than we would have seen some time ago.

I accept that people are going to call me awful things every day, and I will always defend their right to do so.

At the moment that we persuade a child, any child, to cross that threshold, that magic threshold into a library, we change their lives forever, for the better