MACEIO/BRASILIA, Brazil Dilma Rousseff is not the first Brazilian president forced to contemplate the loyalty of Renan Calheiros on the eve of her possible impeachment.
Nearly 25 years ago, Calheiros, the current president of the Senate who will decide the pace of debate over Rousseff's impeachment, weighed the fate of a fellow politician from his tiny northeastern state of Alagoas: Fernando Collor de Mello.
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