Not a big radio listener myself (aside from NPR), but if you want to dig deeper you can find roots of this rise of idiocy to conservative radio hosts. Glenn Beck, Rush Limbaugh, Laura Ingraham, etc. just spread bull$#@! around, and there are just to many of them. Internet memes (like this one below) in social media, with that one line that takes away the nuances of any argument, weakens the position of credible and knowledgeable pundits and experts.
I also found this New Yorker article very interesting on the rise of far-right:
http://www.newyorker.com/news/daily-comment/the-far-right-revival-a-thirty-year-war
” Demographic projections hold that non-Hispanic whites will become a minority around 2050, Zeskind noted. America has always changed, of course, and this shift brings with it the potential of a diverse, dynamic, and flourishing culture. At the same time, Zeskind predicted, a significant number of white Americans would likely mobilize to retain their political and economic influence. “If the past is prologue, a bitter conflict will begin mid-century and continue a full generation,” Zeskind wrote.
As he is quoted in the article, the war started sooner than he predicted