It's important to understand that politics is a dirty profession. It always has been - it always will be.
Corrupt politicians can have an (R) next to their name; they can also have a (D) next to their name. Corruption and greed are not exclusive to one party. It goes to the level of what they think they need to do in order to get your vote.
Doesn't mean it has to be dirty. As voters, we just have to do everything possible to try and vote for those who are not corrupt.