 In May 1964, Clark attempted to take the vacated seat of Richard E. Lankford of Maryland's 5th Congressional District in the primary and lost.In 1966, Clark was appointed to the state Advisory Council on Human Rights by Spiro Agnew and was fired soon-after a confrontation with Agnew.In 1970, he chaired the eight member legislative committee that created "Project Open Space" under Marvin Mandel.