When National Review debuted in 1955, "conservative intellectual" was considered an oxymoron, and Buckley was not off-base when he claimed that historian Richard Hofstadter "analyzed" liberals but "diagnosed" conservatives. The National Review of the '50s and early '60s not only reversed that trend but had a fair claim to being the foremost cultural magazine of its time. If conservatives have outpaced liberals in recent decades as generators of new ideas, Buckley deserves much of the credit.
Richard Nixon signed the Clean Air Act and imposed wage and price controls; Ronald Reagan left office with the Department of Education intact; George W. Bush vastly increased Medicare benefits and plunged the country into a war that Buckley turned against long before that became an acceptable conservative position. (Also to his credit, Buckley emerged in the 1980s as an opponent of the war on drugs.)
Buckley himself was not immune to the contradictions in what used to be called conservative "fusionism." Having largely purged the movement of its libertarian extremes, National Review grew comfortable with executive power, social engineering through tax policy and other ideas at odds with certain tenets of conservative ideology.
But today's conservative identity crisis is a function of the movement's success, and Buckley's combination of courtly manners and a madcap sense of humor (two qualities the current, generally more shrill generation of conservative pundits might want to emulate) helped make that success possible -- sugarcoating seemingly strange and inaccessible ideas until they became commonplace. Liberals and conservatives alike owe him a debt of gratitude for bringing a new intellectual rigor to political discourse.