From the article:
none that might be construed as Tea Party favorites with the possible exception of Ayn Rand's We The Living
What the article does not point out is that the seeming anomaly of Ayn Rand amidst these other favorites of this Dylan Klebold clone is not really an anomaly at all.
These stoner-philosophers, in an attempt to espouse some sort of philosophically-palatable form of anarchy, read Nietzche, Marx, Proudhon, Kropotkin, and above all, H.L. Mencken, thinking to add some sort of hip sophistication to what they are calling anarchy these days ("A" with a circle drawn around it). They tell the grown-ups "dude, anarchy isn't what you think it is". No, to them, it's very deep, very subtle, very workable (if only the rest of us were smart enough to listen).
Now, the fact that H.L. Mencken once called Rand's "We The Living" the most apt rendition of proper political philosophy ever written makes more sense.
This is a strange, esoteric little world some of these lost little misfits inhabit. They espouse a socialist, anarchist, quasi-libertarian mindset drawn from writers who had wildly distorted views of human nature. Almost all of them have trouble relating to the opposite sex.
How do I know this? Teaching high school for 30 years.
You must be a strong person to put up with teenagers for 30 years.