I'm getting a tip that voting machines in Philadelphia were showing votes for Obama BEFORE the polls even opened
In the run-up to Election Day there was a nasty, partisan scuffle with the Board of Elections. Four GOP workers were removed by a liberal judge because they were "the minority party." They purged the Republicans and deprived them of the ability to supervise the voting process.
The same thing happened in the City of Brotherly Love in 2004. About 2,000 votes were preemptively tallied for Kerry. Unrelated, but equally scary, there were reports of someone using a gun to intimidate poll workers there that year as well.