I’m pretty sure there already is — the problem is using the clips of the station employees, not clips of people being interviewed.
You can notice on Rush’s show that he generally READS the questions asked of people, and then plays clips of their answers. That gets around the issues of using the voices of the station employees.
Yes, I think there's something to that. But, Rush is using the fair use exceptions that lasts for some period of time after broadcast - several days I think. But I think there are additional restrictions to playing audio or video of a media interview - interviewee or interviewer - in a campaign commercial. You will certainly see excerpts of opponents saying things on the stump, but I can't remember excerpts of any actual media appearances.