This is such an important point: voter registration information and specific people's voting records are (mostly) publicly available data — you may have to pay a fee to get it, but it is available. It's how political campaigns/parties do outreach and how pollsters contact voters https://twitter.com/sheeraf/status/1319061917231529984

I’ll always take any opportunity to post my favorite PowerPoint slide of all time via the incomparable @JessicaHuseman and Walter from NICAR this year

Here's a fantastic resource from @NCSLorg (as always), breaking down what's in every state's voter file, how that data can be accessed by political campaigns/researchers/journalists/regular citizens, etc, and what purposes it can be used for https://www.ncsl.org/research/elections-and-campaigns/access-to-and-use-of-voter-registration-lists.aspx

Yes, to be clear, *who* you vote for is entirely secret/private. The information in the voter file is just what you put down when you register, so your name, address, phone number, and political party (if you’re registered with one), and then what elections you’ve voted in https://twitter.com/cfmarker/status/1319067261072777218