Congressional candidate Weston Wamp was asked to leave the mall after people complained about his campaigning outside of the 100 foot boundary of the polling place within the mall .
As I recall the same thing happened when East Town Mall in Knoxville had a polling place in it about 6 years ago. If I recall correctly Amy Broyles and Mark Harmon were campaigning there for the Orange ballot and were asked to leave.
While the final outcome is a little foggy to my memory, I thought it was ruled that as long as the candidates were outside of the 100 foot border they could not be stopped from campaigning there. East town later shut down the polling location (Or possibly they just did not have a polling location there the next election, I'm not quite sure). But I don't think they can stop people from campaigning there.
As I also recall the question got down to where does the 100 feet start. The mall doors or the shop space where the polling booths are. I think it was ruled the 100 feet starts where the booths are located.