i think this can sway final results b/c if someone can see a person they don't kinda like is in the running for a seat then they might strategically give there votes to that persons closest rival and try mess up there chances in real election.
what you have to remember also with exit polls where national politics are concerned its based on percentage of people, so they might only publish results of 10,000 people out a population of say 100 million so exit poll are based on tiny percent and have known to be completely wrong.
here though its not a tiny percent its basically anyone on site who cares and results here are more probable to be how it will turn out in real results