We're talking Iowa, here. There are only 75,000 family farms left in Iowa. Even counting 2 voters per farm, that's only 7% of the voting age population in Iowa.
Here's a link from Texas A&M university, indicating a net energy LOSS for generating ethanol from irrigated corn:
http://www.ag.auburn.edu/biopolicy/documents/Net%20Energy%20Balance%20for%20Ethanol%20from%20Irrigated%20Corn.pdf
Actually, the link you sent is from Auburn but is about irrigated corn grown on the high dry plains in Texas, a poor place to grow corn anyway. Most corn of course is dry land raised and the article provides some good science-based evidence, not the left’s usual attack on private businesses. The following is straight out of the executive summary of the article and is supportive of what I have written. “l.1 A more comprehensive analysis by USDA found a 34% net energy gain,2 rising to 67% after accounting for co- product energy credits.3 The consensus is that dryland production of corn results in a net energy gain of 30-70%, depending on soil productivity, production practices, and distillation technology”. Thanks for sending the link.