I read “The Omnivore’s Dilemma.” I know where cornhole comes from. So why was I so surprised on opening up the coupons this week to find one for Heinz vinegar with an ad showing an ear of bright yellow corn? What doesn’t start with corn in this country? How monopolized is the food chain by one heavily subsidized food? Once upon a time a country that grew so dependent on a single vegetable would suffer mightily for it. Now we need new bumper stickers: What would Squanto think?