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Brazilian President Dilma Rousseff will face pro-business senator Aécio Neves in a runoff on October 26.
The leftist incumbent won 41.6% of the vote in Sunday's first round, followed by Neves of the center-right PSDB party with 33.5% of the 142.8mn total votes cast, according to local electoral court TSE.
The key to the runoff may hinge on which one of the candidates can gain the endorsement of Marina Silva, the center-left PSB party candidate that came in third with 21.3% and who was recently polling ahead of Neves.
Officials from Neves' party were scheduled to meet on Monday with Silva campaign representatives to lobby for her backing, according to Reuters, which cited an anonymous PSDB source.
Rousseff is seeking her second term and the fourth consecutive term for the ruling workers' party. Although she remains popular among the country's working class, an economy in recession, high inflation and a corruption scandal involving state-run oil firm Petrobras have eroded her support.