When Rush Limbaugh’s conservative talk show hit Sacramento in the 1980s, no one could have guessed the power that he - and other right-leaning radio hosts - would eventually wield. Limbaugh’s show was part of an attempt to reinvigorate AM radio, which had been rapidly losing audience to FM, and he quickly gained a die-hard audience. Over the ensuing decades, as conservative talk radio grew in power and popularity, it dramatically reshaped the Republican party. And it may well have played a key role in President Trump’s ascent to the White House.

Brian Rosenwald is a scholar-in-residence at the University of Pennsylvania and author of the book, “Talk Radio’s America: How an Industry Took Over a Political Party That Took Over the United States.” He joined us to tell the story of how conservative talk saved AM radio, influenced American politics, and changed our political reality.