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From NBC's Lauren Appelbaum:
Watching the debate tonight, one distraction throughout the entire two hours was a constant chatter from other microphones that had not been turned off. It was especially apparent during the second hour, when WMUR anchor Jennifer Vaughn brought questions from the audience. While candidates were still answering the previous question, we heard her talking with the audience members. At the conclusion of the debate,  you could hear Anderson Cooper  start speaking a bit before he was supposed to. In post-debate coverage, while Larry King was interviewing Elizabeth Edwards, Cooper  could be heard having small talk.