Credited with shaping presidential elections and blamed for creating a climate of intolerance, talk radio rose to prominence in the 1990s by offering Americans a free, unfiltered, and often national forum. Whether the issue was a pushy boss, a hapless sports team, or a downtown-parking crunch, talk radio became a sort of water-cooler for the masses. The rise also reflected the increasingly combative nature of American discourse, with on-air arguments, taunts, and racy, satiric routines often the key to a talk show's success. As ratings increased, so did the critics who believed that the radio hosts were, in part, to blame for the increasingly hostile environment that led to a series of high-profile incidents, including the terrorist bombing in Oklahoma City. Leading talk show hosts Howard Stern, G. Gordon Liddy, and Don Imus were branded "shock jocks" for their brash, obnoxious, and often controversial points of...