In July 2003, Matthew Continetti turned up to begin a new job at the Weekly Standard. Within that building, Continetti writes, was ”the frontal cortex of the American Right.” The Weekly Standard was, he says, the most influential magazine in the city. Copies of the magazine arrived at the White House each week and a photograph hanging from a wall in the magazine’s office showed the then President George W. Bush with a copy. Twenty years later, Continetti has written a history of American conservatism, a study of the age old tension between populism and the elites that have, long…