That is funny.. I never heard the term until today
I had heard it before, but I didn't realize that the phrase had been copyrighted, and could only be used with a specific historical reference.
I just thought it meant grievously slandered.
And in this case it applies:
Conservatives have been 'libeled' (slandered without basis in fact) about an event where blood was spilled (5 slain, over 10 wounded). Except for the copyright protection of this phrase, 'Blood Libel' is a good definition of the slander which has been spewed by the MSM.
I have heard the term a few times, but never its history, much less that its use instantly casts the user as an anti-Semite. Well, that is if the user is Sarah Palin. IIRC, one of Sarah Palin’s grandparents was Jewish.
The woman just has to do her own thing as she’s been doing it. Nothing she says or does, short of publicly endorsing Barack Obama, would ever make a leftist dolt show her one ounce of respect. And, really, she does just fine without their approval.