I have no idea of who developed the mail in ballot tracking system but I have to give them high marks.
I do not know how universal this is or how many states offer ballot tracking, but in PA it worked flawlessly. My wife and I were talking a few nights ago, when we had tracked our ballots, that how refreshing this is compared to the data debacle that ensued at the implementation of the Affordable Health Care Act.
Whoever you are---good job