This ^^^^ It all started soon after Ronnie Raygun did away with the fairness doctrine and right wing radio took over with Rush and his ilk - including Christian Nationalist radio shows. The Dems probably just laughed and scoffed at such nonsense and continued to listen to NPR and American Public radio and watched ABC, NBC and CBS evening news - you know, factually relevant information. They (the dems) didn't feel the need nor urge to produce equal and opposite talk radio shows, until it was too late.
CNN was NOT left-leaning back in the day, in the 1980's. O contraire... Fox labeled CNN as leftist and it stuck. CNN had shows like "Point - Counter Point" which followed the rules of the Fairness Doc. After Pat Buchanan and then NewtG... all the noise began to proliferate... Then Murdoch bought the FOX brand. Once Raygun pulled the plug, Rush and then Fox were able to start pulling the wool over the sheep's eyes.
It's really ironic that a guy like Murdoch, from Australia, and Elon Musk, from S. Africa, have been the two idiot billionaires to facilitate the demise of American Democracy. If history is to attach names to it all - it would have to be all those evil sonsobitches: Raygun, Buchanan, Rush, Newt, Rupert and Musk. There are more names of course (Bill O'Reilly, etc.) but the aforementioned are the Mount "Rush"more.