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As unexpectedly skillful as Bernie Sanders turned out to be as a presidential candidate, he may be positioned now to be even better in another capacity: Movement leader.

The Vermont senator has done a terrific job getting as far as he has in the presidential primary. Starting with almost nothing in the presidential run against presumptive Democratic nominee Hillary Clinton, he battled very nearly to a draw. Up until the New York primary, he retained a plausible route to the nomination, scori...