Food labeling proponents blame loss on well-funded opposition, and vow to continue the fight

California’s ballot measure Proposition 37, which would have required labeling of genetically modified foods, a precursor to probable labeling across the U.S., failed narrowly in Tuesday’s election.

The first major ballot-box test in the U.S. for labeling GMO foods was killed by a tidal wave of opposition spending by giant biotech firms and pesticide makers and multi-national food corporations, advocates of labeling said.