Barack Obama: “It's time to send a clear message to the world: America seeks a world with no nuclear weapons.”

Every president here today, as different as we are, has tried our best to uphold the values that John McCain and Mitt Romney believed in no less than I did.

They're meant to remind us of who we can be, to remind us of what's possible, so we can forge ahead.

Now the ball’s in your court, Iowa.

The essence of Prop. 50 is to say that if you are going to play that game, then we are going to try to counteract that abuse of the system.