Evil does exist in the world. A non-violent movement could not have halted Hitler's armies. Negotiations cannot convince al Qaeda's leaders to lay down their arms. To say that force may sometimes be necessary is not a call to cynicism - it is a recognition of history; the imperfections of man and the limits of reason.

Our destiny is not written for us, but by us.

The good news is that the Paris Agreement is not just a bilateral agreement between the United States and some other country. You have 200 countries who came together. It's an international agreement.

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.

What you have is Mitt Romney running around the country saying 'Well, you know, my wife tells me that what women really care about are economic issues, and when I listen to my wife, that's what I'm hearing.' Guess what? His wife has actually never worked a day in her life.

I can no more disown (Jeremiah Wright) than I can disown the black community. I can no more disown him than I can my white grandmother - a woman who helped raise me, a woman who sacrificed again and again for me, a woman who loves me as much as she loves anything in this world, but a woman who once confessed her fear of black men who passed by her on the street, and who on more than one occasion has uttered racial or ethnic stereotypes that made me cringe.

We know what happens when Europeans start dividing themselves up and emphasizing their differences and seeing a competition between various countries in a zero sum way.