My wife went to vote in the early afternoon and didn't notice the table (When she got home, I asked her if she saw anything she liked since there was sugar feee cake when I was there), but that could have just been because the table is always there and could just blend into the scenery.
They have been having these sales for as long as I can remember, and not once have I heard anyone electioneering. Most people go into the gym to vote first, and then look at the stuff an the way out. I even seem to remember some book sales during either a primary or school board election once, but i think that the books were slanted towards the age of the children attending School 9 (Grades 1-6). It would be hard to say that this constitutes anything wrong, and I would oppose forcing them to stop. As to the hot dog vendor, there wasn't one where I voted.