So what's going on here? Answer: the exit polls are accurate. Pollsters ask, "Who did you vote for?" Unfortunately, they don't ask the crucial, question, "Was your vote counted?" The voters don't know.
Here's why. Although the exit polls show that most voters in Ohio punched cards for Kerry-Edwards, thousands of these votes were simply not recorded.
and then there's this:
Black Box Voting has taken the position that fraud took place in the 2004 election through electronic voting machines. We base this on hard evidence, documents obtained in public records requests, inside information, and other data indicative of manipulation of electronic voting systems. What we do not know is the specific scope of the fraud. We are working now to compile the proof, based not on soft evidence -- red flags, exit polls -- but core documents obtained by Black Box Voting in the most massive Freedom of Information action in history.