Rio de Janeiro, October 24 (RHC-Mercopress) -- In the fourth poll in a row, incumbent President Dilma Rousseff pulled ahead to be the favorite to win Sunday's runoff.

The Datafolha poll, released on Wednesday, was the fourth in three days to show that Rousseff is numerically in front of her rival Aecio Neves.

In the new survey, Rousseff's share of voter support has risen to 47%, from 46% in the previous Datafolha poll published on Monday. Support for Neves was unchanged at 43%.

While Rousseff has widened her numerical lead to four percentage points, the difference between them is still within the poll's margin of error of plus or minus 2 percentage points.

Excluding undecided voters, spoiled and blank survey responses, Rousseff has 52% against 48% for Neves, the poll showed, the same result as in Monday's poll.