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Supporters of former presidential candidate Andres Manuel Lopez Obrador of the PRD (Party of the Democratic Revolution) protest against President Felipe Calderon's proposal to raise taxes outside the Senate building in Mexico City October 26, 2009. Mexican senators met on Monday in an effort to overcome an impasse over Calderon's proposal to raise taxes and reduce dependence on waning oil revenues. Senators from the main opposition Institutional Revolutionary Party, or PRI, met behind closed doors to decide whether to support a measure to raise Mexico's value-added tax, or VAT, one percentage point to 16 percent.