A Common Thread Runs Through Crankery?

While exploring the anti-vaccine mindset, Orac assembles this group under one umbrella:

One of my interests in skepticism and critical thinking has been the similarity in the fallacious arguments, approach to data, and general behavior of those who are–to put it generously–not so skeptical or scientific in their approach to life. I’m talking about believers in the paranormal, quacks, anti-vaccine activists, conspiracy theory mavens, Holocaust deniers, creationists, anthropogenic global warming denialists, and cranks of all stripes.

A commenter calls foul:

I think your first paragraph has something of the strawman construct about it and you could find many examples to question it. To take AGW as an example, this is a concept that has been questioned by none other than James Randi, hardly known for his crank views.
http://www.randi.org/site/index.php/swift-blog/805-agw-revisited.html

Whereas one of the great proponents of AGW is that woomaster general Prince Charles.