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SACRAMENTO – Once riding high, Proposition 37, the statewide ballot measure to label genetically engineered foods, has seen its voter support plummet during the last month, and a new poll shows the high-stakes battle now is a dead heat.

After a barrage of negative television advertisements financed by a $41-million opposition war chest, a USC Dornsife / Los Angeles Times poll released Thursday showed 44% of surveyed voters backing the initiative and 42% opposing it. A substantial slice of the electorate, 14%, remains undecided or unwilling to take a position.

The critical drumbeat of television advertising is having a big effect, voters said. The anti-Proposition 37 spots “made me start looking more into” the issue of genetically engineered plants, said Josie Prendez, 63, a retired school employee in Fresno. She said she concluded that farmers should not be hit with more regulations.