Gas stations across Iowa, like this Casey's General Store in Des Moines, boast ethanol as "cleaner air for Iowa." Clay Masters/Iowa Public Radio hide caption

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Clay Masters/Iowa Public Radio

Got Corn? Ethanol Is No Longer King In Iowa Among Candidates

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A sign on the pump advertises the ethanol content of the gasoline as a motorist reaches for the gas pump in his truck at a filling station in Bellmead, Texas. LM Otero/AP hide caption

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LM Otero/AP