Interesting:

Limbaugh’s audience is often underestimated by critics who don’t listen to the show (only 3 percent of his audience identity themselves as “liberal,” according to the nonpartisan Pew Research Center for the People and the Press). Recently, Pew reported that, on a series of “news knowledge questions,” Limbaugh’s “Dittoheads” — the defiantly self-mocking term for his faithful, supposedly brainwashed, audience — scored higher than NPR listeners. The study found that “readers of newsmagazines, political magazines and business magazines, listeners of Rush Limbaugh and NPR and viewers of the Daily Show and C-SPAN are also much more likely than the average person to have a college degree.”