The industry-backed legislation would bar states from imposing mandatory labeling requirements.
House Dems also want Obama to keep a campaign pledge to impose labeling requirements.
The California Democrat said she believes the FDA has authority to require labeling.
The Washington State measure's failure would reflect the latest in a series of high-profile defeats...
The agency is under pressure to mandate labels on genetically engineered foods.
The move comes amid mounting pressure from advocates for greater disclosure of genetically...
Crucial players press for legislation to institute a national system.