Pundit Press has been on top of sharing very weird and irregular results from 2012 voting in key Swing States:
In looking at the voting data from Richmond, Virginia, an observer is struck by a few things. First is that Mitt Romney and Barack Obama were running neck-and-neck for the first several precincts. Even in heavily democratic precincts, Romney was still garnering around 25-30% of the vote.
Then, all of a sudden, all in order, starting with Precinct 213, Obama received: 90.30% of the vote, then 95.91%, then 89.62%, then 94.68%, then 97.49%, then 94.16%, then 95.09%. Before these Obama numbers began, Romney had gotten over 30% of the vote, and after they finished, Romney shot back up to 23%.