Are you coordinating with other effective animal advocacy organizations, e.g. HSUS and other supporters of California Prop 12? A failed ballot initiative could be worse than not doing it, in case it undermines corporate work or makes future ballot initiatives harder.

Flagging https://forum.effectivealtruism.org/posts/s6kAqweGsbZeZFGRZ/intervention-report-ballot-initiatives-to-improve-broiler

>While on their own these measures would only lead to a relocation of farms to states with different political leanings

You should make sure the restrictions apply to both production and sale, so that products not meeting the restrictions can't be imported.