Sentence:  There's a fairly simple reason for the embrace of radicalism on the right, and it has to do with the <WSD>reactionary</WSD> imperative that lies at the core of conservative doctrine. ... If he is to preserve what he values, the conservative must declare war against the culture as it is. 
Meaning of the word marked with <WSD> tags:  Politically favoring a return to a supposed golden age of the past.