World

Brazilian President Dilma Rousseff takes lead in election poll, outpacing rival Silva

  • Brazil's President Dilma Rousseff, right, who is running for reelection with the Workers Party (PT), poses for selfie photos with supporters after a meeting with athletes as she campaigns in Rio de Janeiro, Brazil, Tuesday, Sept. 30, 2014. Brazil will hold general elections on Oct. 5. (AP Photo/Felipe Dana)

    Brazil's President Dilma Rousseff, right, who is running for reelection with the Workers Party (PT), poses for selfie photos with supporters after a meeting with athletes as she campaigns in Rio de Janeiro, Brazil, Tuesday, Sept. 30, 2014. Brazil will hold general elections on Oct. 5. (AP Photo/Felipe Dana)  (The Associated Press)

  • Marina Silva, presidential candidate of the Brazilian Socialist Party, PSB, waves to supporters during a campaign meeting in Sao Paulo, Brazil, Tuesday, Sept. 30, 2014. Brazil will hold general elections in Oct. 5. (AP Photo/Nelson Antoine)

    Marina Silva, presidential candidate of the Brazilian Socialist Party, PSB, waves to supporters during a campaign meeting in Sao Paulo, Brazil, Tuesday, Sept. 30, 2014. Brazil will hold general elections in Oct. 5. (AP Photo/Nelson Antoine)  (The Associated Press)

  • A supporter of Brazil's President Dilma Rousseff, who is running for reelection with the Workers Party (PT), wears a hat at Rousseff's campaign rally in Santos, Brazil, Tuesday, Sept. 30, 2014. Brazil will hold general elections on Oct. 5. (AP Photo/Andre Penner)

    A supporter of Brazil's President Dilma Rousseff, who is running for reelection with the Workers Party (PT), wears a hat at Rousseff's campaign rally in Santos, Brazil, Tuesday, Sept. 30, 2014. Brazil will hold general elections on Oct. 5. (AP Photo/Andre Penner)  (The Associated Press)

Brazilian President Dilma Rousseff has opened a lead over her top rival in their election race.

A survey by the Datafolha polling group released Tuesday night says 49 percent of voters would cast ballots for Rousseff in a second-round runoff ballot with rival Marina Silva. Silva is backed by 41 percent. A month ago Silva led Rousseff 50-to-40.

The poll says Silva's support in this Sunday's first-round election has slipped to 25 percent. That's five percentage points ahead of third-place Aecio Neves, but the gap between the two is narrowing.

A runoff vote on Oct. 26 is required if no candidate wins an outright majority this Sunday.

Datafolha interviewed 7,520 voters Monday and Tuesday across Brazil. The poll has a margin of error of two percentage points.