Forecasts of the Great Jewish Shift began as soon as the presidential campaign did: This year, we are told, Jews will finally vote Republican, or at least significantly more of them will than have done so in many a decade, perhaps forever. The predictions are a quadrennial ritual. They are made most often by Jewish Republicans, speaking in the bright voice of a compulsive gambler who knows that on this spin, the little ball will absolutely land on the right number. They are made by social scientists certain that reality will finally behave according to their models. They are made by Jewish Democrats as unable to control their anxiety as someone is to stop a tic. This year’s minor variation is the explanation that Jews will switch because they are upset with Barack Obama’s attitude toward Israel.