Petroleo Brasileiro SA (PETR4) fell the most in almost six years as President Dilma Rousseff gained support in a voter poll, sinking wagers that a new government will reduce intervention in the state-owned oil company . Shares of Petrobras slumped 11 percent to 18.60 reais at the close of trading in Sao Paulo , the biggest decline since November 2008. That loss contributed the most to the 4.5 percent drop in the benchmark Ibovespa today. Rio de Janeiro-based Petrobras had gained 95 percent from its lowest level this year in March through Sept. 2 as support for opposition candidate Marina Silva increased. “There was a moment in the past weeks when a victory by the opposition was almost a certain thing, but this expectation seems now more and more distant,” Marcelo Varejao, an analyst at the brokerage firm Socopa, said in a phone interview from Sao Paulo. “The way […]