Senator Miguel Angel Pichetto, who currently serves as president of Argentina’s Senate, has been all his life a member of the hegemonic Peronism movement President Mauricio Macri stunned Argentines and markets on Tuesday by naming the head of the congressional opposition as his vice-presidential candidate in October’s general election. Miguel Angel Pichetto, a 68-year-old lawyer and Senator from the province of Rio Negro has been a loyal and pragmatic member of the Peronist movement since he started…