If you want to know who is buying whom, or subsidizing whom, there’s an app for that. It’s called AllAreGreen. It’s free.
You can use it to see how much money Congressional candidates received, and from whom.
This is going to be a godsend for news reporters. A 16-year-old kid has done their legwork for them.
You can get it here: BuyingAndBought.
As to why it’s important, this clarifies things.