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Environmentalist Marina Silva has surged to a strong second place in Brazil's presidential election and is set to defeat President Dilma Rousseff if the race goes as expected to a runoff, a new poll showed on Wednesday. Silva would defeat Rousseff by 43.7 percent of the votes to 37.8 percent in a runoff, said the survey by polling firm MDA. Both polls show a second round of voting is likely because Rousseff would not win 50 percent of the valid votes in the Oct. 5 election. Silva has clearly pushed the other main opposition candidate, centrist Aecio Neves, into third place and is luring away some of his supporters.