FILE - In this July 20, 2013 file photo, a plant that produces ethanol is next to a cornfield near Coon Rapids, Iowa. For decades, a presidential candidate’s chances in Iowa were wounded if not doomed unless he embraced federal support for ethanol, a now flourishing component to Iowa’s economy in this corn-growing state. That immutable rule collapsed resoundingly early in the last campaign when five of the six top Republican candidates largely renounced a decades-old ethanol tax credit. (AP Photo/Charlie Riedel, File)
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