Charles—
There was a rather curious edit to the Wiki page for “blood libel” yesterday:
Blood libel (also blood accusation) refers to a false accusation or claim that religious minorities, almost always Jews, murder children to use their blood in certain aspects of their religious rituals and holidays. Historically, these claims have–alongside those of well poisoning and host desecration–been a major theme in European persecution of Jews. Contemporary libertarian observers have begun to use the term to refer to attempts by the American Left to accuse American conservatives of contributory responsibility for various incidents of violence.
The citation for the bolded statement is this column by Ann Althouse:
I’m guessing it’s mentioned somewhere in the comments, since all Althouse does is quote Limbaugh and link directly to him.