Animal advocates have always emphasized passing legislation that will protect animals but it is not obvious that, in the farmed animal area, such a focus is worth all the effort. The US Congress has never passed a law protecting animals in factory farms (the last attempt, in 2010, secured just 40 cosponsors). Even the most progressive state legislatures — California, Massachusetts, New Jersey, and New York — have rejected basic farm animal welfare bills. And advocates have had more success by other means, for instance by securing corporate animal welfare policies that exceed the strongest state laws. But even if legislators won’t help farm animals anytime soon, they can still do great harm. State legislators in factory farming states have ...