Voter registration is already public in many states (and searchable online). While that doesn't include actual votes, it does include party affiliation which is obviously a strong indicator. Beyond some extreme exceptions, you can't even opt-out of being listed in this publicly searchable database which includes your home address as well. In other words, voting is hardly anonymous even today.

And even that doesn't account for recent massive scale (191M people) leaks [1].

https://www.reddit.com/r/privacy/comments/3yinij/entire_us_v...