"Liberals have more books"

In Psychology Today's article, "The Ideological Animal", we are treated to such nuanced observations as follows:

Psychologists John Jost of New York University, Dana Carney of Harvard, and Sam Gosling of the University of Texas have demonstrated that conservatives and liberals boast markedly different home and office decor. Liberals are messier than conservatives, their rooms have more clutter and more color, and they tend to have more travel documents, maps of other countries, and flags from around the world. Conservatives are neater, and their rooms are cleaner, better organized, more brightly lit, and more conventional. Liberals have more books, and their books cover a greater variety of topics.
And that's just a start. Multiple studies find that liberals are more optimistic. Conservatives are more likely to be religious. Liberals are more likely to like classical music and jazz, conservatives, country music. Liberals are more likely to enjoy abstract art. Conservative men are more likely than liberal men to prefer conventional forms of entertainment like TV and talk radio. Liberal men like romantic comedies more than conservative men. Liberal women are more likely than conservative women to enjoy books, poetry, writing in a diary, acting, and playing musical instruments.
Really, how scientific is this? Evangelicals with empty (but extremely clean!) bookshelves? Effeminate male liberals crying during "chick flicks"? Yeesh... This article reads more like caricatures of both ideologies than a substantive examination of differences between their adherents. (Besides, on a purely anecdotal level, who can't think of a million exceptions to these profiles?) I'd be curious to read the full publication of this study to see if its conclusions are as cartoonish as this summary implies (surely not, I hope!).