Track that $90 million, and publicize where it landed. Lots of corrupt politicians and regulators. I mean, I'm sure the money has been "legally" spent...just not ethically. Legal loopholes are deliberately left open...
The vast majority of lobbying dollars already are tracked, I recommend OpenSecrets. I don't think it's any secret that politicians are taking political donations and they (when they retire) or former staffers go to work for them for egregious sums of money.