A familiar voice in American media and politics has gone quiet. Rush Limbaugh, the most listened-to radio host in America for 30 years, died Wednesday at age 70. We recall how bracing the Rush Limbaugh Show was in its early days. For decades the airwaves had been governed by the Fairness Doctrine, a federal regulation requiring stations to balance “controversial” claims with “contrasting viewpoints.” The rule gave incumbent candidates and mainstream news outlets a near-monopoly on public discourse. Ronald Reagan scrapped the Fairness Doctrine in 1987. By the 1992 presidential campaign, the radio star’s first name was known across the U.S.