On the C-SPAN Networks:
Clark Clifford was a Secretary for the Department of Defense with 11 videos in the C-SPAN Video Library; the first appearance was a 1968 Compiled Program. The year with the most videos was 1991 with four videos. The year with the highest average number of views per program was 1990 with an average of 578 views per program. Most appearances with Robert McNamara (2), Lyndon Baines Johnson (2).