 By 1959, Jenner had retired and Democrat Vance Hartke had taken his place.Capehart was extremely critical of President Kennedy and his New Frontier programs, such as Medicare and the Peace Corps.In 1962, Capehart attained his greatest popularity and what would ultimately become his lasting legacy as one of the key figures in the Cuban Missile Crisis by calling for a "crack-down on Cuba" and warning of a missile build-up on the island.