Thats not what we are talking about at all. You need access to these machines somehow it's not about classifying people it's about getting access to the ballot machines and altering them or their results. Quite a different task.
I think your parent was implying that some sort of classification would be used to predict where the vote would likely be close, so you would know which precincts to target. As I'm not the poster, this is just speculation of course, and can be worth the electrons used to transmit the comment :)