The potential for fraud was well documented in the Presidential election results in 2004, most notably in Ohio. If the media hadn't been so busy trying to obscure and downplay the hundreds of incidents in Ohio, and distract us with other events like the Ukrainian election, we'd have had a different President. The recount was fraudulently conducted, and the results of the recount of actual paper ballots (the "provisional" and "absentee" ballots), showed a strong preference for John Kerry. Interesting how the electronic voting machine results favored Bush, and the actual paper ballot count favored Kerry.
Of the 66 Ohio Counties, 63 shifted more toward Kerry on the combined "provisional" + "absentee" count. In fact, if those counts had been mirrored in the electonic voting machine counts, Kerry would have won in Ohio by over 500,000 votes.