When the members of the French socialist Party held their summer seminar in the pretty coast town of La Rochelle last month, they discussed the sort of topics that only a true policy wonk could love. Does there need to be "a new equilibrium between labor and capital"? Is Latin America "the new horizon of socialism"?

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nginx/1.14.0 (Ubuntu) Behind the high-toned banter, however, lay a visceral political yearning.

France's left has not held the nation's presidency since 1995, and it is hungry for power. It might be thought odd, then, that the person who has the...