Brazilian presidential candidate Dilma R

Brazilian presidential candidate Dilma Rousseff, from the Workers Party (PT), speaks during an individual debate at the XIII National Meeting of Mayors, in Brasilia, on May 19, 2010. Chief minister Dilma Rousseff -- Brazilian President Luiz Inacio Lula da Silva's pick to be his successor when he stands down at the end of this year -- has become a frontrunner in the election race, pipping the previous favorite, former Sao Paulo state governor Jose Serra of the opposition conservative Social Democrat party for the first time, a survey showed Monday. Brazil's presidential election will be held October 3, with a run-off between the top two candidates on October 31 if one does not get more than half of the vote. AFP PHOTO/Evaristo SA (Photo credit should read EVARISTO SA/AFP via Getty Images)