The Humane Society is spending $100,000 on ads to influence the members of the conference committee, including the three Minnesota Democrats on it, U.S. Sen. Amy Klobuchar and U.S. Rep. Collin Peterson and U.S. Rep. Tim Walz.
Peterson and Walz backed the amendment in committee, where it passed by a voice vote, which typically indicates near-unanimous agreement.
Walz said the pork producers in his district treat their animals humanely and he's concerned laws such as California's are being pushed to drive meat producers out of business.
"If these people's desire is to not have people eat pork or whatever it is then they can just state that and we'll not come to an agreement,” he said.
But Senate Democrats, including Klobuchar, oppose the measure to rein in the California law and say they'll work to keep it out any final farm bill agreement.