a paper by Steven F. Freeman, PhD.

Summary:
"As much as we can say in social science that something is impossible, it is impossible that the discrepancies between predicted and actual vote counts in the three critical battleground states (Ohio, Florida, and Pennsylvania) of the 2004 election could have been due to chance or random error....

The likelihood of any two of these statistical anomalies occurring together is on the order of one-in-a-million.  The odds against all three occurring together are 250 million to one."