WNYC's "One the Media" have done just this:

"How Rush Limbaugh Paved The Way For Trump" (2021)

<https://www.wnycstudios.org/podcasts/otm/episodes/how-rush-l...>

Audio: <https://chrt.fm/track/53A61E/pdst.fm/e/dts.podtrac.com/pts/r...> (MP3)