For the purpose of electing members of the General Assembly and the senators from Assembly districts where so required in 1967 and until the 1970 census of the United States for New Jersey shall have been received by the Governor, the Assembly districts shall be established by an Apportionment Commission consisting of ten members, five to be appointed by the chairman of the State committee of each of the two political parties whose candidates for Governor receive the largest number of votes at the most recent gubernatorial election. Each State chairman, in making such appointments, shall give due consideration to the representation of the various geographical areas of the State. Such Apportionment Commission shall be appointed no earlier than November 10 nor later than November 15, 1966, and their appointments shall be certified by the Secretary of State on or before December 1, 1966. The Commission, by a majority of the whole number of its members, shall certify the establishment of Assembly districts to the Secretary of State on or before February 1, 1967.