Cornball politics: is the sun setting on ethanol as an Iowa caucus decider?

Ted Cruz, an avowed opponent of the influential biofuel lobby, is riding high in the polls as the global oil price falls. Big Corn is staring down the barrel

For decades, presidential candidates seeking to compete in the Iowa caucuses have dutifully pledged their support for the production and sale of ethanol.

Related: Republican 2016 contenders invade Iowa to talk up ethanol and court rich donors