NEW : `` My mission is to eradicate poverty , '' he said. Dilma Rousseff wins against Jose Serra in a runoff . She 's a a former left-wing guerrilla fighter turned chief of staff .
NEW : `` My mission is to eradicate poverty , '' Rousseff says in victory speech . Dilma Rousseff wins against Jose Serra in a runoff . She 's a a former left-wing guerrilla fighter turned chief of staff .