Lie detectors would be a good start.
Have someone known for getting violently angry (here I'm thinking John McEnroe, but if there's anyone better, I'm listening) pacing around onstage so whenever a candidate fails to answer the question asked, Something Bad would happen.
Have a screen behind them flashing the corporate logos of big sponsors.
Have the questions for candidates written by teh other side. For example, Fox News would get to try to trip up Obama while MSNBC decides what Romney tries to weasel out of.
Lastly, better candidates.