opensecrets.org (if you're in the US) to see whose money your elected get - but then we have darker influences too. Go to DC and take a long walk, much is visible
No, I'm not in the USA. We have a two party system here, albeit a softer one than the US, with some other parties getting MPs. It is well known that certain rich people influence our politics more than they should. It's barely even hidden since some of them get given government contracts or honours so that they can put letters after their name.