Good way to loose your job very quickly. I don't think we should have to rely on somebody sacrificing themselves to make a difference.
1) Be an investigative Journalist
2) Purchase access to these location vendors data
3) Correlate data with known mobile numbers of politicians
4) Find things in data that might be of interest to readers (e.g. "politician x was noted to be in the same place as Lobbyist y on 5 different occasions")
5) Publish Story :)
still need an outlet for the story though
Few have the stomach for that sort of thing...