What this demonstrates is that voter fraud is not an isolated incident or a simple mistake. Voter fraud is an organized, regular activity. Hundreds of dead voters (and those are just the obvious, easily discovered ones) voting in pretty much every election.
Solving the problem of dead voter is easy enough. These people should be removed from the rolls when they die, not allowed to remain and used for fraudulent election practices. But they are likely only the tip of the iceberg. How many elections have already been stolen?
We will never know until we start taking voter fraud seriously.