An eight-way chess clock. Each candidate gets 10 minutes to answer all questions they receive, and any left at the end of questions could be used as the candidate wishes. Candidates who zero out the time on their clocks have their microphone turned off. If that isn't good enough, then it's time to be escorted off the stage.
Or: No Time Limit At All. Let them go at it as long as they want. Any time they look like they're losing steam, that's when the moderator tosses out another question.
Disinfo-meters on the Screen. As candidates are speaking, dials along the bottom show how relevant the answer is to the question, the degrees of factual the content and/or hypocrisy in the answer.
