Many states have very loose control over their voter database. The control is mostly exerted through the force of the law prohibiting certain uses of the data.

Many states have very loose control over their voter database. The control is mostly exerted through the force of the law prohibiting certain uses of the data. For example, I can order the voter database for the state of New York and receive it on a CD in a few weeks. Other states will simply email you a link to a big bundle of CSV files. There is other information besides what is on the voter database in this disclosure, it appears, but the voter data itself is mostly not a secret and can be trivially accessed by any citizen. They just have to promise not to break the law around what they do with it.