David Pakman, host of his eponymous podcast and program, joins me to talk about his book "The Echo Machine" and how right-wing extremism has methodically undermined America's shared information ecosystem over decades. Pakman and I discuss the deliberate fragmentation of media from talk radio through social media, explaining how this has eroded critical thinking and created parallel realities in American politics.

Drawing from his position as both media practitioner and analyst, Pakman illuminates the economic and psychological forces that incentivize division. Our conversation explores the compelling case for changes in the way the left understands poltics and media in a post-truth environment.