Also the web page is woefully out of date. There is absolutely no corn surplus anywhere. Ethanol production ate up every last available kernel, to the point that chicken feed became scarce - endangering your tasty mcnuggets!
I dont think its an actual subsidy (price support). Its more like insurance, production control (CRP) etc. My brother grew corn for 20 years, and never received any direct "subsidy". That web link doesn't explain any of this, it just throws around careless terms without explaining them - slanderous yellow journalism?
The US Government subsidizes corn production to the tune of like $22 an acre or something like that so corn based products are artificially cheap.