Sen. Bernie Sanders' appearance on the Rachel Maddow show last week really stuck in Bill O'Reilly's craw like a chicken bone, so he tried to spit it out by naming Sanders a "Pinhead" on The O'Reilly Factor last night.

Here's what Sanders said:

Sanders: We need to do grass roots organizing. I'll tell you what else we need to do. We need to understand that it is very, very hard for the president or anybody else to take on, not just the Republican Party - that's the easy part - to take on all of right-wing talk radio which covers 90 percent of talk show hosts, a whole FOX Network which is nothing more than an arm of the Republican Party.

O'Reilly's response: To make fun of Sanders' thick New England accent and insist that Sanders' charge was "false" -- though of course he had no way of proving otherwise. Especially since Sanders is saying something every sane person who watches Fox (admittedly, those numbers are shrinking) can see for themselves.

Though to be more precise, Fox actually is an arm of movement conservatism, and the GOP is the movement's political home. So they are both components of the same ideological movement, which means that Fox isn't really an arm of the GOP, but rather its ideological partner and cohort. The difference, though, is purely a matter of nuance, since the result and effect are exactly the same.