Midwest politicians, Democrats included, are pushing to raise the ethanol content in gasoline. Much of this is produced from corn.
http://uk.reuters.com/article/idUKN1029043720090210?pageNumber=1&virtualBrandChannel=0Farm corporations produce so much corn that they have to get rid of it somehow. We can only eat so much of it.
Meanwhile, these corporations are rewarded with subsidies so that they continue to overproduce.
Take a look at these subsidies. You can look up individual farmers on this site, too.
http://farm.ewg.org/progdetail.php?fips=00000&progcode=corn&page=states®ionname=theUnitedStateshttp://farm.ewg.org/progdetail.php?fips=00000&progcode=corn&page=conc®ionname=theUnitedStatesAnd just in case you buy the argument that corn ethanol reduces the use of oil, just watch these farmers till, ferilize, pesticide, herbicide their fields. Much of these substances are oil-based. And then there's the processing. Some even use airplanes to spread pesticide.