Marina Silva, shown here in Rio de Janeiro on Wednesday, is tied in polls with incumbent President Dilma Rousseff. Silva, the candidate for Brazil's Socialist Party, says if elected next month, she would be "the first social environmentalist president."
Evangelical Christians hold their hands out in prayer during the annual March for Jesus in downtown Rio de Janeiro, Brazil, in 2013. Evangelicals play an increasingly large role in the nation's politics.
Victor R. Caivano/AP