Found an interesting graph on the net.
It compares what the exit polls predicted with what the vote counters
actually reported.
The first three show states that used paper ballots, and the polls
match the votes pretty closely.
The other six are states that used electronic voting machines, and
the votes are wildly different from the polls, in favor of Bush.
Exit polls got a bad name back in the 2000 election, but I've always
thought they reflected the intent of the Florida voters
more accurately than the counted votes.
The Florida 2000 exit polls said that more voters intended to vote
for Al Gore, and that's actually what happened there, despite official
vote totals (and Supreme Court decisions) alleging otherwise.