Blood Serotonin and Power Seeking

Douglas Madsen from The University of Iowa reports that whole blood serotonin seems to be linked with power seeking personalities of the type common among politicians. You can read the whole report here.
It seems to me that, though biochemistry may drive people to seek power, it does not necessarily correlate with intelligence, morality, empathy, creativity or communication skills; all things we may prefer in a politician. It reminds me of the old jokes:

"... it is a well-known fact that those people who most want to rule people are, ipso facto, those least suited to do it."

Douglas Adams.

 “In politics, stupidity is not a handicap.”

Napoleon Bonaparte.