These incidents, and other incidents where a person is physically blocked or impeded is not just harassment but can also be construed as an assault. Should this happen to you, you would be justified in telling the individual who is physically blocking you to "Get out of the way, NOW!" and if they do not comply immediately, then pound them to the ground so they can't get back up. Then call the police and press charges against them.
Return inside and get an election judge.