As described in this New York Times article, Missourians are set to vote on a statewide constitutional amendment to "guarantee the right to 'engage in farming and ranching practices'.”
The amendment is supported by several farm groups in the state, and it comes about in response to initiatives in other states that have (or have tried to) outlaw certain animal production practices such as gestation crates for sows and battery cages for hens or to restrict use of genetically engineered crops.
I'm not sure what to think about these sorts of amendments (a similar law was passed in North Dakota, and if this one in Missouri passes, I suspect we'll see similar propositions in other states).
On the one had, I see the supporters of the law trying to prevent the "unfunded mandates" that have occurred in other states: voters passing laws that shoppers are not fully willing to pay for via premiums in the marketplace. On the other hand, the text of the law is vague and it is difficult to foretell what will be the consequences, intended and unintended alike.
The amendment seems to enshrine a type of protectionism that is unlikely helpful for the economy. Imagine an amendment to protect university professor's right to "engage in teaching and research practices" or an amendment 100 years ago to protect wagon wheel makers right to make wagon wheels. It's hard to imagine those propositions gaining much support. They - like the one aimed at farming - seem to violate of Kant's categorical imperative insofar as the rules attempt to set a different standard for farmers or professors or wagon wheel makers than for other workers or business owners.
This quote from a farmer in the NYT story reflects that sentiment:
That said, the attempt to paint this as a battle between "family farms" and "factory farms" is largely misplaced. As if small family farmers don't like technology. For example, here's one quote from Joe Maxwell, who works for who works for the Humane Society
There are many more kinds of agriculture than two. Many family farmers are large; many use technology precisely because they want to take care of their land and animals.