The production and transportation of ethanol uses more energy than ethanol yields. State and Federal ethanol subsidies cost American taxpayers billions, while increasing the price of fuel at the pump and lowering the mileage of consumers' vehicles.
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Mitch Daniels is a forthright defender; since he became Governor of Indiana, the number of ethanol plants in his state have risen from one to thirteen and he set a goal of producing 1 billion gallons of the stuff.
This is a big problem with litmus tests, because Daniels does so well in other ways. If he were to move against ethanol in a meaningful way before the Iowa caucuses, I could support him. Right now I'm not sure.