We had a poll worker here in Cincinnati who was proud that she voted six times for Obama in the last election. All she got was a slap on the wrist. I think fraud such as this can undermine this Republic and, as such, should find the person serve 1 year in jail, minimum, and lose their voting privileges forever. In Lake County, Indiana, dead people vote, often twice! In that case, the Board of Elections should serve jail time.
Personally I think voter fraud is a knife right to the heart of our republic. When found, they should be strung up on a lamp post as a warning to others.