Unfortunately (or maybe fortunately) they don't both do it. Voter fraud seems to be a dominantly Dem activity, and it is very dangerous for the future course of the country.
Philadelphia, according to thieir study, had more voter fraud than any other city in the nation. The same thing happened in 2000. This does not bode well for Santorum's re-election chances in 2006 unless the Republicans stand up to the union thugs and racial hucksters in Philly. Fat chance of that happening...