File photo of Sarah Palin in Clarkston

Sarah Palin addresses the audience during the “Americans For Prosperity Foundation Summit” in Clarkston, Michigan in this May 1, 2010 file photo. The prominent U.S. Republican on Monday defended her reference to “blood libel” that aroused controversy last week when she used the term to condemn criticism linking her fiery rhetoric to the Arizona shootings. REUTERS/Rebecca Cook/Files (UNITED STATES – Tags: RELIGION POLITICS)