Call to make sure any recently deceased (and not so recent) relatives and friends are not on the voting rolls.
There are a couple guys here in NH trying make it a law that every town has to review their voter rolls/checklist at least once every two years. The current law on the books is once every ten years.
The reason they are promoting it is because when they went through the checklist/voter roll in their own town they found about a 30% difference of extra voters on the list. Some were dead people. Most had just moved somewhere else. This is a town with very little rental property too. The population is about 13K.
Imagine what the number is in a big city with a large amount of rental housing. Even worse are the college towns where kids come and go every year. This is why the easiest place in NH to potentially cheat is in the college towns.
Not in a town like I live in where there are 1100 registered voters.