The greatest threat to U.S. and global security is no longer a nuclear exchange between nations, but nuclear terrorism by violent extremists and nuclear proliferation to an increasing number of states.

There's nobody to guide through the process of becoming a man... to explain to them the meaning of manhood. And that's a recipe for disaster.

I hope people appreciate Chancellor Merkel because, although she traditionally is considered center-right and I'm considered center-left, the truth is that we share those core values, and those are worth protecting. As the senior leader in Europe, as the leader who's been longest lasting, I think she has great credibility, and she is willing to fight for those values. I'm glad that she's there, and I think the German people should appreciate her. Certainly, I have appreciated her as a partner.

My main message is to the parents of Trayvon Martin. You know, if I had a son, he'd look like Trayvon.

I very much believe in reforming the tax system.

If you have health care, my plan will lower your premiums. If you don't, you'll be able to get the same kind of coverage that members of Congress give themselves.

That just gives sort of the democracy an opportunity to test ideas, for those who lost to catch their breath, regain energy, re-energize themselves and then get back in the arena, and then we'll make some more progress in the future.