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By Silvio Cascione and Brad Haynes BRASILIA/SAO PAULO (Reuters) - Brazil's financial markets have rallied on the prospect of environmentalist Marina Silva unseating President Dilma Rousseff in next month's election, but political donations show plenty of companies may be wary of a new administration. Silva's market-friendly proposals promise relief for oil giant Petrobras, ethanol mills and private banks. The money pouring into Brazil's stock market has gone in the opposite direction, driving up shares of companies that would benefit from a Silva presidency and lifting the Bovespa index as much as 11 percent when she first surged in polls. "Right now in the investor community we're focused on just getting Dilma Rousseff out of office, but once Silva is in power it's a different ball game," said Aryam Vazquez, a senior economist with the Oxford Economics investment consulting firm.