Even in a close race, you would need to alter upwards of 50K votes to have an effect. There are two ways to do that only way to do that: 1) tamper with the voting machines, 2)tamper with the eligible voter rolls or the registration process. Both of these seem to be in the sphere of Republican antics.
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http://www.newsmax.com/Newsfront/Romney-Philadelphia-Electio......

And the unofficial vote tallies have President Barack Obama beating the former Massachusetts governor by a combined vote of 19,605 to 0, The Philadelphia Inquirer reports.
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I also read Romney got 0 votes in 9 precincts in Ohio. I mean i can understand Philly is heavily democrat, but this seems a little much.
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I am sure glad there is no such thing as voter fraud, nor is there any question of curious voter registration in any of those precincts.

Reps are supposed to just ignore everything and be chastised. BS things stink this election, the smell is awe inspiring.