Chuck is off for the next couple of weeks, you will be stuck with producer Will. This episode features an interview from July 7, 2007 with S. Derek Turner when he discussed what his group, Free Press, has done with the Center for American Progress. Their study, "The Structural Imbalance of Political Talk Radio," shows how the right wing's grip on the airwaves is because of a failed market, not a cultural revolution.
You can find the report here: https://www.americanprogress.org/article/the-structural-imbalance-of-political-talk-radio/