The intense fight over food labeling has led to a bombardment of radio and television ads.
"We are seeing at least one ad an hour here," says Stacy Malkan, a spokeswoman for California's Right to Know, a group that supports food labeling. "Unfortunately, that is the only thing a lot of voters are seeing about Prop 37."
Independent Vermont Sen. Bernie Sanders, who has lobbied hard for food labeling on the federal level, says that ballot initiatives like the one in California are critically important for consumer protection.
"I would love to see this done nationally, but right now we have to depend on states to do this," Sanders says.
However, Sanders worries that big agri-business is buying a victory.
"When companies like Monsanto have an endless end of money, can they ever be defeated in a post-Citizens United world?" Sanders says. "I would simply hope that the people in California study the issues. This is not a radical concept after all. It is being done in 49 countries around the world."
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Lauren Fox is a political reporter for U.S. News & World Report. She can be reached at email@example.com or you can follow her on Twitter @foxreports.