BOB SCHIEFFER: Good evening from the campus of Lynn University here in Boca Raton, Florida. This is the fourth and last debate of the 2012 campaign, brought to you by the Commission on Presidential Debates. This one's on foreign policy. I'm Bob Schieffer of CBS News. The questions are mine, and I have not shared them with the candidates or their aides. The audience has taken a vow of silence — no applause, no reaction of any kind except right now when we welcome President Barack Obama and Governor Mitt Romney. (Sustained cheers, applause.) Gentlemen, your campaigns have agreed to...