> revealing what candidates or parties voters chose
> revealing what candidates or parties voters chose
> This did not happen.
The list of fields at http://www.databreaches.net/wp-content/uploads/DataFields.jp... does include 'party', although I suppose that information is only as confidential as the voter registration anyway.
EDIT: The replies indicate that my last sentence was unclear. Contrary to what it seemed to say, it meant that, since the voter registration isn't confidential, neither is the party information (except that sometimes the voter registration is confidential, as discussed in the article and my 'uncle' comment (https://news.ycombinator.com/item?id=10801570 )). Maybe I should have phrased it, equivalently but more clearly, as "that information is as public as the voter registration anyway".
The point of my comment was just that it is not true that "voters' parties weren't revealed", which I took to be part of dfc's comment (https://news.ycombinator.com/item?id=10801543 ).
Campaigns will also use it to target their literature; you might send one mailer to the members of your own party ("X is a totally loyal party member, here's seven things he did to support our core party values!"), another mailer to the opposition party ("X is not a total baby eater, here's five ways he crossed party lines to support things you probably care about!"), and a spattering of other mailers to the third-parties to emphasize support for their particular interests.
The weirder thing to me is that these databases also include birthdays. You could send birthday cards to everyone.
The list of fields shown is not complete, as they clearly state. They may have a reason known only to them, don't ask me what it is, for holding back information on fields they did not show.