BRASILIA (Reuters) - Brazilian President Dilma Rousseff has extended her lead ahead of Sunday's presidential election and would win re-election in a likely second-round runoff, while her two main challengers are tied for second place, polls showed on Thursday.
Environmentalist Marina Silva has continued to slip and is now only 3 percentage points ahead of centrist candidate Aecio Neves, according to the Datafolha polling firm, a statistical tie because it is within the poll's margin of error.
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