If this veteran of French politics — he started as a young Socialist senator in 1986 — pulls it off, France's election could end up a contest between two radical outliers. Both Mr. Mélenchon and Marine Le Pen of the far-right National Front gleefully promise a top-to-bottom shake-up, rejecting the country's European Union membership, blasting its budgetary and deficit rules, and injecting France with huge doses of public spending.
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