Just to give you a hint at what is in the article New Court Filing Reveals How the 2004 Ohio Presidential Election Was Hacked, I have the following snippet:
Connell served as the IT guru for the Bush family and Karl Rove. Connell ran the private IT firm GovTech that created the controversial system that transferred Ohio’s vote count late on election night 2004 to a partisan Republican server site in Chattanooga, Tennessee owned by SmarTech. That is when the vote shift happened, not predicted by the exit polls, that led to Bush’s unexpected victory. Connell died a month and a half after giving this deposition in a suspicious small plane crash.
Arnebeck asked Spoonamore whether or not SmarTech had the capability to “input data” and thus alter the results of Ohio’s 2004 election. Spoonamore responded: “Yes. They would have had data input capacities. The system might have been set up to log which source generated the data but probably did not.”