Brazilian President Dilma Rousseff is scheduled to greet the Olympic flame today, but the pomp and ceremony will seem empty to a president likely to be suspended from office just a week later. The arrival of the flame in Brasilia from an ancient Greek temple via Switzerland will trigger a three-month countdown to the Rio de Janeiro Olympics and Brazil’s big chance to shine on the global stage. However, the supposedly joyful occasion coincides with the Latin American giant’s plunge into a political furnace,...