Populists In The Piazza: A Referendum Unleashes Forces That Could Change Europe [Getty Images]

A European flag, right, an Italian flag, centre, and a Ferrari SpA flag, fly above the entrance to the Ferrari SpA factory in Maranello, Italy, on Tuesday, Oct. 4, 2016. After Britain's stunning decision to withdraw from the European Union, now comes another ballot that could topple a leader should Italy defy Prime Minister Matteo Renzi over what, on paper at least, is the constitutional issue of reducing the size and powers of the Senate. Photographer: Alessia Pierdomenico/Bloomberg via Getty Images

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