It's true that there are many too many low information idiot voters out there, but I believe that Fox News Channel has several times the number of viewers as does CNN. (Not that FNC hasn't drifted from "conservative" toward a mixture of conservative and leftist commentators for this presidential year.) As for "Evening News" on CBS, NBC, and ABC, I believe their ratings have drifted steadily downward for decades.
Perhaps someone can post some recent comparative ratings data for all these stations.
Surprise, surprise.