I don't know. Maybe it's because I'm used to a thin layer of social protection where I live, so I'm very sensitive when I'm elsewhere in the country, but go into not just the south, but the Midwest, and I think the gains are negligible.
Which might make it worth engaging in MI/WI/PA/MN, but I'm not sure about LA/AL/MS or KS/NE/MO. At least on a national level; I think local engagement is necessary and a must no matter where you are.
That's all anecdotal on my part, though. Fair enough if you think differently.