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>Outside of each location will be people holding signs of all candidates

isn't it illegal to campaign within a certain radius of a polling place?

In my experience the campaigners are instructed by the officials running the voting site what that radius is and stay outside of it.

That would be a state-by-state law. There is no such law in Maryland as far as I know.

I voted in Maryland this morning, and there was a sign about 25 feet from the door marking the spot where electioneering becomes illegal.