Fewer than four weeks before the first round of voting in France's presidential election, former prime minister Manuel Valls has provoked outrage in the Socialist party by supporting centrist independent Emmanuel Macron rather than his own party's candidate, Benoît Hamon. But could an establishment endorsement join Mr Macron's investment banking past as a vulnerability against attacks from Marine Le Pen? Michael Stothard joins Harriet Agnew to discuss.

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