 A 2007 survey by Pew Research found that Limbaugh listeners demonstrated among the highest knowledge levels in response to a battery of political current affairs questions, with 79% having either a high or moderate level. Among Fox News viewers, the number was only 65%, second to last, with nightly news watchers faring worse. Here's a funny aside. The most informed were watchers of Comedy Central's Daily Show and Colbert Report, also at 79% combined, but with a larger number of high levels of knowledge.