Thats what I thought originally, but now I've heard different in that, it would be the equivalent of Dan Rather running for office while maintaining his nightly news job. Opposition candidates, could (not necessarily would, but its a risk) ask for or demand equal airtime.
I do know for a fact, that NBC will not run any episodes of Law and Order where he appears, if he declares, its not that big a deal to them, but TNT is really screwed since they will not run any episodes that feature him, and all they have are the repeats. HBO is also in the same boat for his upcoming movie.
Keep in mind that when Arnold (I am not sure how to spell his last name) was running for governor of California, all sorts of problems came up, including arguments that him appearing on a news program tobe interviewed should automatically entitle every single other candidate to the same time.
I don’t think that cable tv is under the same restrictions. I don’t know about during the campaign, but it must be so at least after someone takes office. I’ve seen Arnold movies all over TNT and other channels since he’s been in office.