It is not just politicians. It is well documented that the hookup scene is most "successful" for those with dark triad traits, and for those who emulate those traits. Just start searching for male oriented sites about "game", and it will be clearly and clinically described what works and what doesn't for female attraction.
http://en.wikipedia.org/wiki/Dark_triadThe dark triad traits and other game techniques work. I've made it work on my own wife (triggering attraction, and other attraction based behavior response) and neither of us have been anywhere near nor interested in the casual sex / hookup scene, ever. Due to that trial run success, it has become a set of techniques I've been slowly implementing for over a year now to improve our marriage.
So the real point is, we are all attracted to these dark triad traits. Politicians are successful in implementing it in a non-overtly sexual way.
There are several conclusions that I have come to with this experience...
Ideologically, this shows that power should never be concentrated, but rather it is important that the system is designed to suppress these behaviors. Since this attraction are innate in all humans, therefore it can't be avoided by direct democracy. Democracy will in fact, select for it. Only strict constitutional limits can prevent or slow the behavior selection.
Or as Hayek describes pragmatically, concentrated power attracts the wrong kind of people. So even if gov't power starts with good people, the wrong people will supplant the ones with good intentions. The good intentioned naturally lack the desire to RULE and will be supplanted by those who do desire it.
Similarly, the old rules of marriage & sexuality were designed to have the same effect on controlling the self destructive behavior of animalist female and male tendencies. This control has been destroyed by modern culture, yielding 40-50% divorce rates, and >50% new births out of wedlock. This in turn yields more of the same feral behavior, while causing lasting damage to children, adults, and society.