The region’s rural heritage and progressive politics will collide next month when Sonoma County residents vote on a first-of-its-kind ballot measure that could banish Perdue’s chicken facilities, along with all other large factory farms. The proposed law — which would cap the size of animal agriculture facilities and phase out all large factory farms in the county within three years — faces long odds. If successful, it could reshape the face of farming in the county and set a precedent that has terrified agricultural interests in California and across the country.

Known as Measure J, the proposal has produced fierce debate in the county over the environmental, public health, and animal welfare impacts of modern animal agriculture. It’s poised to generate the highest campaign spending of any ballot measure in Sonoma County history, with about $2 million in contributions made for and against — the vast majority of which has been spent by industry in opposition.