Ethanol: Trump's trump card in Iowa?

Trump has peppered his Iowa stump speeches with praise for the fuel, and hit Cruz for opposing the ethanol mandate.

The Trump campaign considers the issue one that could sway people struggling to decide between two like-minded candidates courting a similar demographic of voter.

“I don’t think we should ever lose track of the fact that national security and the economy and immigration and a lot of these issues are very important, but I would say ethanol plays a tie-breaker role,” Sam Clovis, Trump’s national co-chair and senior policy adviser, said.

“If you come down to two candidates you like … it’s the idea of who has the most complete portfolio to address the issues of the state.”