So if no voter fraud is committed
Voter fraud is almost non-existent in this country
If you think voter fraud is a "serious" problem, can you post some evidence to back up that claim? For some evidence that it is not, I recommend Dr. L Minnite's "The Myth of Voter Fraud" in which she undertakes a pretty rigorous quantitative analysis of voter fraud in the US and concludes that voting errors are far more likely to be caused by human and machine error than by fraud. I also read "Stealing Elections" by John Fund to compare the two and the latter was wholly unconvincing, not only for its blatant partisanship but for its total lack of any attempt at systematic analysis.