Will they ever learn that the exit polls are useless?
On the contrary. The exit polls (phony as they may be) are a good way to depress the Republican vote and supress turnout on election day.
Calling races before the polls close is another of their tricks ("go home, your vote doesn't matter!").
I missed all the hubbub about the exit polls in 2004 because I was working at the polls. The one thing I noticed then was that most of the early voters were Republican. It was a small precinct and there were only a few Republicans who came to vote on election day. Anyway with early voting, there is no way an exit poll is going to be accurate.