Imo, what they did was HIGHLY illegal and an open violation of the laws.
I don't live in Michiga. I live in Virginia, but 100 feet seems to be the standard in every state, which makes me think it may be federal law, or an FEC rule. My wife is going to be a poll watcher this afternoon, and I tell you I will put her up against any dem in the nation, including union workers. She makes me wish I lived in Ohio or Florida, because they will get by with NOTHING with her around.