Communist Party of the Soviet Union first secretary Nikita Khrushchev chaired the Presidium from 1955 to 1964; Leonid Brezhnev succeeded him that year and chaired until 1982. In contrast to full members, candidate members of the Presidium could not vote during Presidium sessions. It was normal that a full member of the Presidium had previously served as a candidate member, but this was not always the case. During the term 23 people held seats in the Presidium: 14 full members and 9 candidate members. One candidate member was promoted to full membership in the Presidium during the term. Not a single Presidium member died during this period while retaining office.