...makes it sound like Trump himself was the one who was oh so smart and dedicated to study those many hours of talk radio. Trump has the attention span of a gnat, according to his biographer.
Again, I think talk radio has an impact. I think the biggest impact is keeping the base fired up enough to vote. And that's huge. They have to be hammered repeatedly with nonsense so as to not lose faith and energy.
But I'd bet most of the people listening to Limbaugh today are the same people who listened yesterday and the day before that and the day before that and the day before that. I suspect most have their preset stations and stick with those. There are some who just happen upon talk radio and might be swayed to believe something they wouldn't otherwise believe, but I'm not sure that's a large number of folks. I could, of course, be wrong about that. I haven't seen any evidence to support or dispute that. I can certainly be swayed by solid evidence that talk radio is converting a substantial number of people.
My hunch is that those who believe the nonsense that's spewed by Limbaugh, Savage, Hannity and the rest are, for the most part, inclined to believe that nonsense. People driving around aren't blank slates. Their upbringing, personality type, education, brain chemistry and much more all play a role.
There is far more right wing talk radio than left wing talk radio, because that's the way corporate sponsors like it. There's a good deal of community radio, which is often progressive, but it relies upon public funding and doesn't reach nearly as far. So I agree that it's akin to Wal-Mart vs. mom and pop.