Brian Rosenwald joins Ben and Bob to discuss his new book Talk Radio's America: How an Industry Took Over A Party That Took Over the United States, which traces the emergence of talk radio as a major powerhouse in shaping the Republican Party. Brian explains how conservative talk radio and hosts such as Rush Limbaugh came to have tremendous influence over the GOP's policy agenda, ultimately laying the groundwork for Donald Trump's victory in the 2016 Republican Primary. Brian also discusses how his conclusions have changed since his first appearance on RTN in November 2016.

Dr. Brian Rosenwald is a scholar in residence at the Partnership for Effective Public Administration and Leadership Ethics at the University of Pennsylvania and an instructor at Penn. He also conducts research for the Slate podcast Whistlestop, and serves as one of the two Editors-In-Chief of Made By History, a Washington Post history section. You can follow him on twitter at @Brianros1.

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The Road to Now is part of the Osiris Podcast Network. This episode was edited by Gary Fletcher.