John D. Deardourff, who helped pioneer the fledgling postwar profession of political consulting and who served a string of prominent Republican clients, died Friday at his home in McLean, Va. He was 71.
The cause was cancer, said Douglas L. Bailey, his former business partner.
Their firm, Bailey, Deardourff & Associates, founded in 1967, dispensed political advice, produced commercials and engineered campaigns over a quarter century that defined the golden age of moderate Republicanism. Their clients included Gov. Nelson A. Rockefeller of New York, Mayor John V. Lindsay of New York, Senator Charles H. Percy of Illinois and John C. Danforth, the former Missouri senator who recently resigned as delegate to the United Nations.