Note that this is used by campaigns prior to the election to be able to target voters that have not yet voted. Here in Washington state, you receive your mail-i

Note that this is used by campaigns prior to the election to be able to target voters that have not yet voted. Here in Washington state, you receive your mail-in ballot 3-4 weeks before Election Day. I usually return mine as soon as I get it. Campaigns can query this data repeatedly up to Election Day. Knowing that I have already sent in my ballot spares me from needless phone and mailed campaign literature and saves campaigns the cost of sending out useless material.