RIO DE JANEIRO, Sept 10 (Reuters) - Brazilian financial markets briefly added to losses on Wednesday after an opinion poll showed President Dilma Rousseff and competing presidential candidate Marina Silva statistically tied in an expected second-round vote in October.
Brazil's stocks and currency have been posting losses over the past few days on fears that Silva, regarded by investors as the strongest option to avoid four more years of a government they strongly dislike, would lose her lead in opinion polls.
The Brazilian real weakened to as much as 2.2967 per dollar minutes after the Vox Populi Institute said Silva had 42 percent of voter support in a second-round vote, only one percentage point ahead of Rousseff. The real later traded at 2.2931 per dollar, still 0.3 percent weaker on the day.
The benchmark Bovespa stock index dropped to 57,835 points after the survey was released. It later traded at 58,041, still 1 percent weaker for the day. (Reporting by Walter Brandimarte; Editing by Chizu Nomiyama)