An example of the more subtle, "hidden" network TV bias: my wife was watching the CBS comedy Becker, and Becker (ultra-leftie Ted Danson) was treating a dumb teenager who feared he had a sexually transmitted dissease. The kid never used condoms (this was their "AIDS awareness: episode, BTW), and thought that "if he did get AIDS, they could cure it with one of those cocktails, right". Becker later said only a Republican could've been dumber than that kid, which got a big laugh from the audience/laugh track.
Liberal ideas constantly are slipped into sitcom scripts, and with the exception of Drew Carey (is he even on anymore?), damned few conservative jokes ever get "slipped into" TV scripts.
Will; "It will be the gay social event of the season"
The kooky rich gal; "With the exception of the republican national convention."
Subtle leftist brainwashing propaganda rules on network television.