One problem with parity in fraud is that some places are easier to twist than others, and cities are among the worst. If cities tend to produce a particular kind of voter, or particular party, and rampant fraud is easier in cities, then we can expect the states at large to be heavily biased towards the party of cities. To get parity one would have to have another population center that was biased the other way, but cities are strangely one color across the country.