Now this explains a lot (on both sides of the fence)

From The Examiner:

Serial killers and politicians share traits
By: Law Enforcement Examiner Jim Kouri

Psychopathy is a personality disorder manifested in people who use a mixture of charm, manipulation, intimidation, and occasionally violence to control others, in order to satisfy their own selfish needs. Although the concept of psychopathy has been known for centuries, the FBI leads the world in the research effort to develop a series of assessment tools, to evaluate the personality traits and behaviors attributable to psychopaths.

Interpersonal traits include glibness, superficial charm, a grandiose sense of self-worth, pathological lying, and the manipulation of others. The affective traits include a lack of remorse and/or guilt, shallow affect, a lack of empathy, and failure to accept responsibility. The lifestyle behaviors include stimulation-seeking behavior, impulsivity, irresponsibility, parasitic orientation, and a lack of realistic life goals.

Research has demonstrated that in those criminals who are psychopathic, scores vary, ranging from a high degree of psychopathy to some measure of psychopathy. However, not all violent offenders are psychopaths and not all psychopaths are violent offenders. If violent offenders are psychopathic, they are able to assault, rape, and murder without concern for legal, moral, or social consequences. This allows them to do what they want, whenever they want. Ironically, these same traits exist in men and women who are drawn to high-profile and powerful positions in society including political officeholders.

The relationship between psychopathy and serial killers is particularly interesting. All psychopaths do not become serial murderers. Rather, serial murderers may possess some or many of the traits consistent with psychopathy. Psychopaths who commit serial murder do not value human life and are extremely callous in their interactions with their victims. This is particularly evident in sexually motivated serial killers who repeatedly target, stalk, assault, and kill without a sense of remorse. However, psychopathy alone does not explain the motivations of a serial killer.

What doesn't go unnoticed is the fact that some of the character traits exhibited by serial killers or criminals may be observed in many within the political arena. While not exhibiting physical violence, many political leaders display varying degrees of anger, feigned outrage and other behaviors. They also lack what most consider a "shame" mechanism. Quite simply, most serial killers and many professional politicians must mimic what they believe, are appropriate responses to situations they face such as sadness, empathy, sympathy, and other human responses to outside stimuli.

Emphasis mine -- Kouri nails it. His website is not up at this time but he writes columns for American Daily and Renew America. From his biography:

Jim Kouri, CPP is currently fifth vice-president of the National Association of Chiefs of Police. He's former chief at a New York City housing project in Washington Heights nicknamed "Crack City" by reporters covering the drug war in the 1980s. In addition, he served as director of public safety at a New Jersey university and director of security for several major organizations. He's also served on the National Drug Task Force and trained police and security officers throughout the country.

His other columns are a good read -- the guy is sharp and knows what he is talking about...