Look at the list posted above about the tiny amounts these huge companies spent "bribing" politicians: https://news.ycombinator.com/item?id=6770059.

The fact of the matter is that Procter and Gamble doesn't need to "bribe" any politicians to get favorable legislation. They just have to call up a Congressman and say: "hey, we have tens of thousands of workers in your state, it would be a shame if anything happened to them."