It might have cost Gore the election. It could have been a factor that just decided not to show up in the exit polling. But, was still in the voter's minds.
At such a miniscule margin, a thousand minor factors are responsible for Gore's loss, ranging from the weather to traffic to what was on TV on election day to the price of milk.
On the Atlas Forums, it's likely that this is an inane statement. So I'll respond to the original poster's question: Yes, it had an effect on the margin, and it's likely that it hurt Gore more than Bush. And if it did, it almost certainly affected the outcome of the election.