I expect all actors, including corporations, to act in their own self-interest. The problem isn't that they corrupt the political process. I expect them to try to shift the rules into their favor. The problem is that the political process is corruptible in the first place. That's what we should be working on ... and the only way to fix it is to instill an expectation of identical treatment for everybody.
All citizens, all parties, play under the same set of rules.
If you start playing favorites with the poor or some depressed economic sector, it simply opens the door for everybody else to play the game and game the system.