From dKosopedia

This timeline collects events pertaining to the history of progressive talk radio. A major focus of the timeline is the adoption and abandonment of the progressive talk format by radio stations across the U.S. In some instances, events relating to conservative talk show hosts (e.g., Rush Limbaugh, Morton Downey, Jr.) are listed for comparison. Major sources for the timeline include Liberal Talk Radio, Wikipedia, and David Brock's The Republican Noise Machine: Right-Wing Media and How It Corrupts Democracy (2004).

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