Is liberalism a Mental Disorder ?

Lately, I'm sure most of us rational types are wondering the same thing. "Liberalism is a Mental Disorder" is a book written by Michael Savage. I have not read the book but the modern Liberal Democrat party (Leftist) seem to have a genetic coding which seemingly spawns hate, anger, irrational thought, emotional hysteria, extreme intolerance of opposing views and even violence (which I predict will become more prevalent in the coming months).

Several months ago, while sitting in the Doctors off ice for a physical exam, two older men began a conversation about health care. It was immediate clear which gentleman was the liberal. His voice was shaking with emotion, As is common with the left, he referred to Obamacare by it's proper name The "Affordable Care Act" and referred to Obama as "Barack". The conversation began to get a bit more hostile, the liberal gentleman voice was increasing shaking and it was obvious he was becoming emotionally agitated. Out of the blue, pure rage erupted. He began pointing at the TV (which was showing Fox News Channel) and went in to a near incoherent rant about Fox. The receptionist as demanding quiet but as the other gentleman stated.."Ma'am we've got a violent liberal on our hands, you might as well call the police. At this point, the guy was trying to remove the TV from the wall. All of this over a simple conversation about Health Insurance. We've seen the emotional outbursts from TV guests / commentators but I personally have never witnessed this in person. A real live leftist going ballistic.

So what is it with the people of the left? At least by my standards, they don't appear to be emotionally healthy, quite the opposite. Is this a psychological condition?

Here's a good article from National Review about the extremist nature of these individuals. At the least, this isn't the Democratic Party of 30 years ago.