BRASILIA (Reuters) - Brazilian President Dilma Rousseff has extended her lead over environmentalist Marina Silva ahead of the Oct. 5 presidential election and would win a likely second-round runoff, a new poll showed on Thursday.
Rousseff has 43 percent of voter support against 36 percent for Silva, according to the survey by the Ibope polling firm, widening her advantage to seven percentage points from four since the previous poll released on Tuesday.
In first-round voting that takes place on Sunday, Rousseff has 40 percent voter support and Silva 24 percent. That compares with 39 percent for Rousseff and 25 percent for Silva in the previous Ibope poll. Support for centrist candidate Aecio Neves was unchanged at 19 percent.
If no candidate wins an outright majority in the first round, the election will be decided in a runoff between the two leading candidates on Oct. 26.
The new Ibope poll surveyed 3,010 respondents nationwide between Sept. 27 and Oct. 2. The survey has a margin of error of plus or minus two percentage points. The results were posted online by the Estado de S.Paulo newspaper.
(Reporting by Anthony Boadle)