Okay... you couldn't be immune from the lure of the ring, but how does the ring corrupt one if one doesn't have political ambitions from the start. I mean... the only one who really held it at any length was Smeagol, and as Tiger Tale so aptly put it, to him the ring would have provided one long Imperial Fish Fest.
So, does the ring always corrupt in a dark lord sort of way, or is Overtaxed more correct when she said that it corrupts according to one's ambition.