Bob Schieffer who's moderating has said he's going to make them stick to answering the questions and try to get them off stump-material, to get more specific. I think the theme is pretty open, so this should be interesting, especially since Obama seems to be baiting McCain (http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/10/14/MNTT13H4GU.DTL) into bringing up the Ayers/terrorist stuff up in the final debate.