BUZZ-U.S.-listed Brazilian stocks slip
** State-owned Brazilian oil producer Petroleo Brasileiro Petrobras SA's U.S.-listed shares down 5 pct at $15.89, while miner Vale SA down 4.2 pct at $11.50, tracking decline in their home market
** Petroleo Brasileiro SA's shares fall in Sao Paulo amid a general sell-off two weeks ahead of the presidential election
** Brazil's benchmark Bovespa stock index was down 2.17 pct
** An electoral poll showed President Dilma Rousseff gaining on challenger Marina Silva ahead of next month's presidential election
** Investors have been critical of Rousseff for enacting policies they see as detrimental to the private sector and state-run companies
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