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SAO PAULO, June 6 (Reuters) - Preferred shares of Brazil's state-run oil company Petroleo Brasileiro SA, known as Petrobras, jumped in opening trading on Friday after a poll showed the country's president, Dilma Rousseff, lost support among voters ahead of an October election.
Investors are optimistic a new administration would enact policies more favorable to the company's minority shareholders.
At 10:13 a.m. (1313 GMT), Petrobras shares were up 6.5 percent to 17.38 reais. (Reporting by Asher Levine; Editing by Jeffrey Benkoe)