Unfortunately, it seems like most of the large organizations that have lobbying power are against keeping animals for food, period. They are as likely to lobby laws that will prevent you and I from having our backyard flocks as they are to lobby for the humane treatment of commercial egg production birds.
I don't know of one off the top of my head that doesn't also lobby against rights I hold dear. I think education and the slow/local food movement is the best thing that can happen to the victims of giant commercial agriculture operations.
Reminding people that there are living creatures behind each and every egg they crack into their omelet and asking them to consider the source and vote with their dollars is a much better approach, IMO, than legislation. Legislating animal treatment can, unfortunately, be a slippery slope, and can often very quickly lead to limiting our rights as backyard flock owners.