Political Corruption has probably been in existence since the dawn of politics, so providing a comprehensive list would be impossible.

But here are a few sites with a few examples:

From The Political Graveyard

Feds Kept Busy With New Mexico Politicians

Political corruption: Catching minnows not the whales

Slimy Illinois Politicians Take State from Bellwether to National Joke

Duke Cunningham

Jack Abramoff

We are certain of one thing, more to come...