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

toggle caption 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

toggle caption LM Otero/AP