http://www.washingtonpost.com/wp-dyn/content/article/2007/03/28/AR2007032802174.html Federal campaign law requires broadcasters to give all candidates equal time on the airwaves. That rule applies to entertainment programs like "Law & Order," meaning stations that run the show would be required to give other GOP candidates a like amount of prime-time exposure. FCC equal-time rules would impact the former senator and current "Law & Order" star if he runs for president. With as many as a dozen or more Republican candidates competing for the nomination, that would be prohibitively expensive. "As a practical matter, [the television stations] would in all likelihood have to pull all of the Fred Thompson shows for the duration of his candidacy," said Andrew Jay Schwartzman, president of the Media Access Project.