It’s all about bucks, baby.

Under the equal-time rule, if a network gives time to one political candidate, it is required to provide the same amount of airtime to his or her opponents. In other words, if Thompson appeared on a “Law & Order” episode for 10 minutes during prime time, NBC would have to give Thompson’s rivals for the Republican nomination 10 minutes of prime time each.

“The equal-time requirement applies when the person has legally qualified as an official candidate in a relevant state — for example, having his or her name formally approved to be on a state’s primary ballot — not merely when he/she declares his or her intent to run,” an NBC spokeswoman said. “If Fred Thompson formally announces his intention to run for president, NBC will not schedule any further repeats of ‘Law & Order’ featuring Mr. Thompson beyond those already scheduled, which conclude on Saturday, September 1st.”