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From a historical point of view, Jews and Moslems have largely gotten along, while Christians have relentlessly persecuted Jews. Often, Moslems have protected Jews from Christians. The last 60 years have been a major aberration in Moslem-Jewish relations, of course.
Still, you can't blame Jewish voters from being suspicious of a right-wing Christian fundie. They've got nearly 2000 years of history that supports their concerns.