The original url at CNN is here. I don't know if the story is literally true, because some cursory Googling suggests there are other book stores in Laredo, although it also shows the B. Dalton phone number as current.
"...Our research indicates that da Vinci, Michelangelo, Shakespeare, and Galileo basically hoisted the entire intellectual transformation of mankind onto their shoulders while everyone else just sat around being superstitious nimrods," said Sue Viero of the Correr Museum of Art in Venice, Italy. "Here's da Vinci busting his ass to paint such masterpieces as The Last Supper and the Mona Lisa, while some loser like Albrecht Dürer is doing these dinky little woodcuts that are basically worthless."
Dana Nelson is a professor at Vanderbilt, and I believe Bad for democracy is her second book. Her publisher sent me a copy some time back, and unfortunately I've been busy with other matters, so I've just started on it. It does look promising, discussing the history of popular representations of the role of the president in US society, which she regards as generally anti-republican, in the classical sense, and far more often geared towards representing the president as the prime mover of government upon whose shoulders all power and responsibility lie, a phenomenon she terms presidentialism.