Yes, I mean you, the former Governor of Alaska. Do you have any idea what the term "blood libel" refers to, and why it's just plain wrong to use it in connection with the discourse surrounding the shooting of a Jewish Congresswoman?
Criticism of the terms of discourse: not the same as false claims that Jewish people kill Christian children to make ritual use of their blood. You can't, and should not, be taking on the mantel of the oppressed. You're not oppressed; you're not being falsely accused. You had the crosshaired map on your web site and took it down within an hour of the shootings in Tucson.
You have, indeed, contributed to poisoning the discourse, both before and after that terrible event.