A new poll finds support for Proposition 37 on California’s November ballot dropping. Prop. 37 would require labels on all foods containing genetically-modified ingredients.

The Pepperdine University School of Public Policy and California Business Roundtable poll shows support has declined by 19 points in the last two weeks, dropping from 67 percent to 48 percent.

Michael Shires, an Associate Professor of Public Policy at Pepperdine says one reason for the change might be that 43 percent of voters say they’ve seen ads about the measure. “It’s always hard to attribute specifically whether it’s learning, it’s them doing their homework, or whether it’s the media campaigns. But clearly you have to believe, given the amount of advertising that’s been going into it, that’s got to be one of the factors.”

The “No on 37” campaign has spent about 19 million dollars to oppose labeling GMO ingredients.
 
Voter opposition to the measure increased from 22 percent to 40 percent in the past two weeks, while undecided voters remained at 11 percent.