Yeah...no.
It isn't "rife" within the system. It is extremely rare, actually.
Between 2000 and 2010, there were a whopping THIRTEEN confirmed and convicted cases of voter fraud. There were 47,000 cases of UFO sightings in the same time frame.
Truth about fraud
Voter fraud statistics
The lie that there is a voter fraud problem is believed by many and blabbed across the internet and via the media. But it's not true. It is, however, a lie of convenience when you want to pass laws to make it harder for certain classes/races/party members to vote.
On the other hand, a political party actually hiring a company that commits such fraud is a whole 'nother story.