Now we may know that there are so few cases of voter fraud because it is so easy to commit that few get caught (tip to Instapundit):
New York City’s Department of Investigation (DOI) has just shown how easy it is to commit voter fraud that is almost undetectable. Its undercover agents were able to obtain ballots for city elections a total of 61 times — 39 times using the names of dead people, 14 times using the names of incarcerated felons, and eight times using the names of non-residents. On only two occasions, or about 3 percent of the time, were the agents stopped by polling-place officials. In one of the two cases, an investigator was stopped only because the felon he was trying to vote in the name of was the son of the election official he was dealing with.
It makes sense that voter fraud must be a problem. As the government has gotten more powerful, the stakes of winning elections go up, and so the incentive to cheat is higher.
Do you really want to tell me that the "by any means necessary" crowds wouldn't dream of committing fraud?