Bulgarian-descended Dilma Rousseff is the favorite at Sunday's presidential elections in Brazil, as world media report the official end of the campaign.

Recent surveys have shown support for Rousseff at 49-52%, while her rival Serra has 38-40%. In the first round on October 3, Rousseff garnered some 47% of the votes, while Serra got 32.6%.

The biggest surprise was Marina Silva from the Green Party, who was considered an underdog but scored 19.3% of votes, more than any third-ranked candidate in years.

The result is considered part of the cause for the runoff this Sunday. The Greens nevertheless chose not to back any of the two candidates in the runoff.

Commentators suggest that a smaller turnout will work in Rousseff's favor, for disgruntled or more apathetic Brasilians are seen to be leaning towards opposition candidate Serra.

Rousseff's apparent success is seen as a result from massive backing she has received by outgoing Brazilian President Inacio Lula da Silva.

The results of Sunday's elections are eagerly expected by the local residents of central Bulgarian town of Gabrovo, where Dilma's father Petar (Pedro) Rousseff was born.

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