Well, cinyc had made a good point that no RL media calls an election when the votes are still being casted.
Seriously though, I wonder how far we can relate to RL here, as RL elections also don't have the possibility to count votes before the end. Part of what Atlasia makes interesting is this "look bore leads by 3 votes; oh no, now TNF is a vote behind...", and if that means some races will have apparent winners early on, well, so shall be it, I'd say.
Did CNN called Florida for Gore before polls actually closed?