The town population is around 2,500. It may be that the laws here are something like "don't block the entrance or harrass people." 100 yards from the building is across the street. They have candy on the tables and a bake sale in the corner, away from the voting stuff. It may be up to the local governments to decide how to handle campaign folks, and I don't think they'd do anything unless a problem occurred. Even then, I think the problem would probably be handled like "Eldron, either get that friggin' LaRouche sign out of my face, or the next time your dog craps in my yard, I'm gonna try out my wife's hair remover on 'im!"

As for the size thing, I don't see how it matters that much.