Fox host Glenn Beck has had it (4/27/10) with opponents of Arizona's new immigration law making analogies to Nazi Germany:

I hate to rain on the hate parade here, but can we please slow down for just a minute and, I don't know, think? You are comparing the systematic, cold-blooded extermination of  millions of Jews to America making sure people are here legally. The parallels are... nonexistent.

Indeed. The guy who's made a regular habit of deriding various White House officials as Communists, Maoists and the like is urging restraint with the historical analogies. Save the Hitler talk for people who really are behaving like the Nazis. Like Al Gore's climate change activism, for example:

Here's Beck talking about Al Gore on his radio show in 2006 (Media Matters, 6/8/06):

When you take a little bit of truth and then you mix it with untruth, or your theory, that’s where you get people to believe. . . . It’s like Hitler. Hitler said a little bit of truth, and then he mixed in “and it’s the Jews’ fault.” That’s where things get a little troublesome, and that’s exactly what’s happening.

UPDATE: Here's Glenn Beck on the cover of the current issue of Extra!, comparing the systematic, cold-blooded extermination of millions of Jews to...religions calling for social justice: