Exhibit A for the mainstreaming of right-wing extremism is Fox News’s new star, Glenn Beck. Here we have a network where, like it or not, millions of Americans get their news — and it gives daily airtime to a commentator who, among other things, warned viewers that the Federal Emergency Management Agency might be building concentration camps as part of the Obama administration’s “totalitarian” agenda (although he eventually conceded that nothing of the kind was happening).

But let’s not neglect the print news media. In the Bush years, The Washington Times became an important media player because it was widely regarded as the Bush administration’s house organ. Earlier this week, the newspaper saw fit to run an opinion piece declaring that President Obama “not only identifies with Muslims, but actually may still be one himself,” and that in any case he has “aligned himself” with the radical Muslim Brotherhood.

And then there’s Rush Limbaugh.