 turns are spaced just eight feet apart. The 90-minute debate will feature two commercial breaks. No staffers will be allowed on stage. A two-minute answer to each question will be followed by a one-minute rebuttal and then a response to that rebuttal. CNN has agreed to mute the microphone of the candidate who isn't recognized to speak. And that particular aspect of the evening could be key, says ABC Chief Washington correspondent Jonathan Karl. I think