Farmers own nearly half the nation's ethanol plants. The plants boost corn prices by creating demand for corn. And by owning their own plants, farmers hope they can capture some of the profits traditionally reaped by commodity processing giants such as Cargill and Archer Daniels Midland. But now, just as the ethanol industry seems poised for a boom, the farmers who own Minnesota's oldest and largest ethanol plant are thinking of getting out. Stockholders in Marshall, Minnesota -based Minnesota Corn Processors are expected to vote next month on whether to sell their company to Archer Daniels Midland, the nation's largest ethanol producer. Minnesota Public Radio's Mary Losure reports.