When the same corn was marketed in Europe with the mandated labels for genetically-modified food, no one bought it, just like no one would here if they knew. Since labeling became mandatory in Europe, these products are not even marketed in stores anymore.
Walmart, however, refuses to label its poison corn in the US, and Monsanto has launched a multi-million dollar campaign in California to block the labeling of its poison products in California supermarkets. They know that when consumers know, their gig is up. From RT:
You can fight back, however. Join the effort to make labeling mandatory. From AZGREEN: