The campaign against Washington state's genetically modified food labeling initiative secured another major donation on Tuesday -- a $3.25 million check from Dupont Pioneer.

That comes on top of a $4.6 million donation from Monsanto that was disclosed this week in filings with the state Public Disclosure Commission. The filings also show that the campaign against Initiative 522 secured a $500,000 pledge from BASF Plant Sciences last month.

To date, the anti-522 campaign has raised $11.1 million, far more than the $3.5 million secured by the Yes on 522 campaign.

I-522 would require food and beverage companies to label products that contain genetically modified organisms (GMO). Supporting the labeling mandate is a coalition of organic food companies, farmers and natural health advocates. They are facing a well-funded campaign backed by some of the largest mainstream food companies and biotech agribusinesses like Monsanto and Dupont Pioneer.

The I-522 contest on Washington's fall ballot is shaping up much like the 2012 campaign in California over a similar labeling proposal. There, major food and agriculture interests spent more than $45 million to defeat Proposition 37 by a 53 percent to 47 percent margin. Supporters raised just $8.1 million. Donors on both sides of the California campaign are making similar commitments to the pro- and anti-522 campaigns in Washington.

A new Elway Poll released Tuesday showed the Yes campaign leading among Washington voters, 66 percent to 21 percent.

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