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Macon, Missouri (CNN) – President Barack Obama donned a hard hat and goggles Wednesday to tour an ethanol plant in Missouri, then touted biofuel production and other alternative energy sources to free the United States from dependence on foreign oil.On the second day of his two-day swing through Iowa, Missouri and Illinois, Obama told workers at the POET Biorefining plant in Macon that their work creates a stronger economy for the nation and their own community.