Petrobras ADRs Slump As Polls Favor President Rousseff By: TalkMarkets October 01, 2014 at 18:04 PM EDT The one most exposed to the outcome of next month's general election in Brazil is state-run energy giant Petrobras. Read More >> Related Stocks: Centrais Electricas Brazil ADR Itau Unibanco Banco Holding S.A. ADR Petrobras - Petroleo Brasileiro S.A. Vale ADR Representing One Ord Shs