Since we were told it pertains to officeholders, I then took a gander at my GriffGraph template and attempted to update it to reflect the most recent elections in the NE and MW (please correct me if I'm wrong on any of the offices!). Because of this, I am going to go out on a limb here and assume that none of our CJOs, SC Justices nor cabinet members were involved (since they aren't politicians in the truest sense of the word; presumably no cabinet member would have the audacity to do something like this to another cabinet member and think they'd get away with it).
I can assure you, Adam, it was not evil Lumine 
The GM told us bluntly that it was not Lumine, so we can rule him out and further narrow down the categories.
What is left? Based on this criteria alone, there are 20 names remaining (the offices not blacked out)!
These names were pulled using the criteria outlined above and nothing else. This means that nearly all of them ultimately had nothing to do with it. It was still interesting for me to attempt to do. With that being said and unless I have misjudged the nature of the other offices/officeholders in the game, I'm nearing 100% confidence in saying the perpetrator is on this list.
Wait, how did you manage to exclude every Labor officeholder from your list?
