Prop 2 update

It looks like Proposition 2 in California is doing well, with the latest poll showing 72% in favor of and 10% against. As far as animal welfare goes this is a pretty mild measure, it bans cages for breeding sows, nesting chickens and veal calves. There must be enough room for these animals to do things like stand up, turn around and spread their wings. My question is, who are the 10% who think this is unreasonable?