Silver says that politicians and psychopaths share certain characteristics, which include lack of remorse and empathy, a sense of grandiosity and manipulative behavior.
The question, then, is whether it is reasonable to believe that people with serious abnormalities in the way they interact with the world can be found running for (and winning) office. However unsettling as this may be, the answer seems to be yes. It's possible for psychopaths to be found anywhere -- including city hall or Washington, D.C. Remember, psychopaths are not delusional or psychotic; in fact, two of the hallmarks of psychopathy are a calculating mind and a seemingly easy charm.
There is more at work than just the drive to seek office, though; psychopaths may have some peculiar talents for it, as well. Research has shown that disorder may confer certain advantages that make psychopaths particularly suited to a life on the public stage and able to handle high-pressure situations: psychopaths score low on measures of stress reactivity, anxiety and depression, and high on measures of competitive achievement, positive impressions on first encounters, and fearlessness. Sound like the description of a successful politician and leader?