Is the "politicing set-back" different in each state? In Calif you must be at least 100' away from the building.
While I was getting my ballot from the clerk a lady came in to get a "count" - I assume she was an observer. The clerk told her to stand against the wall and she would take care of her when she was able --- loved it.
I do not know if it is different in every state. I do know that in the library where I voted early here in Central Florida, two voters with Kerry/Edwards shirts were in line. Maybe because it was a library nobody stopped them.