I barely follow on the first part, you lost me with your abbv. on the second part. WTF, expand please. I'm not sure what you're trying to say.
Why would any corp. donate to pol:
1. They want protection from the government.
2. They want changes in the tax code, earmarks, grants etc.
This is no different than the mafia and organized crime.
In the mafia - you pay the local chieftrain either for protection money from other gangs or for a territory to do shit, like gambling, drugs, etc.
The govt is no different than the mafia in almost every respect.