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Italian voters have the unenviable task next week of choosing among two populist clowns, a politically challenged academic and the leader of an unpredictable coalition of the left. We aren’t Italians, so we don’t get a vote. We have a stake, nonetheless: If Italy gets this wrong, it may put back into question the future of its economy and the survival of the euro, sapping what life remains in the global economy. None of the choices are good, but some are terrible.