Genetically modified crops are everywhere in the U.S.—some 85% of corn, the staple crop in the U.S. food system, is genetically modified. Though mainstream scientific research says that GM foods are harmless, a growing number of environmentalists still view them with suspicion. Hence California’s Proposition 37, on the ballot in November, which would have required the labeling of all foods made with genetically modified ingredients. Though the pro-Prop 37 forces—led by prominent food writers like Michael Pollan—held an early advantage, the proposition ended up losing, thanks in part to tens of millions of dollars in campaign spending by agricultural companies like Monsanto.