When I read history, I [see] what typically happens to presidents and the other party during tumultuous times and how people react when the economy is collapsing and they're losing their homes, losing their pensions - it sort of tracks, what ended up happening, because some of that is human nature.

We can have reasonable, thoughtful gun control measure that I think respect the Second Amendment and people's traditions.

I will promise you this, that if we have not gotten our troops out by the time I am president, it is the first thing I will do. I will get our troops home, we will bring an end to this war. You can take that to the bank.

I am confident that Assad's days are numbered. But what we can't do is to simply suggest that, as Governor Romney at times has suggested, that giving heavy weapons, for example, to the Syrian opposition is a simple proposition that would lead us to be safer over the long term.

Steve was among the greatest of American innovators - brave enough to think differently, bold enough to believe he could change the world, and talented enough to do it...The world has lost a visionary. And there may be no greater tribute to Steve's success than the fact that much of the world learned of his passing on a device he invented.

The walls between old allies on either side of the Atlantic cannot stand. The walls between the countries with the most and those with the least cannot stand. The walls between races and tribes; natives and immigrants; Christian and Muslim and Jew cannot stand. These now are the walls we must tear down. We know they have fallen before.

If you look at how I've tried to and how I'll continue to try to govern, I'm not driven by some ideological agenda. I'm a pretty practical guy and I just want to make sure that things work.