Helena Rousseff , a former Marxist guerrilla , wins the first - round vote . CNN 's Shasta Darlington and Umaro Djau contributed to this report . She fell short of the majority needed to avoid a runoff . President José Eduardo Pereira da Silva voted for her . Rousseff will face Jose Serra in the second round .
Helena Rousseff , a former Marxist guerrilla , wins the first - round vote . She fell short of the majority needed to avoid a runoff . President José Eduardo Pereira da Silva voted for her . Rousseff will face Jose Serra in the second round .