I should have said this a few days ago, when my friend Glenn Reynolds introduced the term to this debate. But I think that the use of this particular term in this context isn’t ideal. Historically, the term is almost invariably used to describe anti-Semitic myths about how Jews use blood — usually from children — in their rituals. I agree entirely with Glenn’s, and now Palin’s, larger point. But I’m not sure either of them intended to redefine the phrase, or that they should have.