They are ALL crooks!
Every politician that accepts campaign contributions, Democrat or Republican, Left or Right, is a crook! Each and every campaign contributions is a bribe, plain and simple. Whoever accepts a bribe is a crook.
ALL campaign contributions should be banned. No exceptions. There should be a $10,000 limit on campaign spending, and it must all come from the pocket of the candidate him/herself.
All lobbying by all for-profit organizations should also be banned. What is a lobbyist? A guy with a suitcase full of money looking for a politician who is for sale (which is all of them).