Vice President of the United States the Twenty-fifth Amendment established a procedure for filling such a vacancy: This procedure has been implemented twice since the amendment came into force. The first instance occurred in 1973 following the October 10 resignation of Spiro Agnew, when Gerald Ford was nominated by President Richard Nixon and confirmed by Congress. The second occurred 10 months later following Ford's August 9, 1974 accession to the presidency upon Nixon's resignation, when Nelson Rockefeller was nominated by President Ford and confirmed by Congress. Had it not been for this new constitutional mechanism, the vice presidency would have remained vacant after Agnew's resignation and
Vice President of the United States to have been elected president while not an incumbent, as well as the only person elected twice to both the presidency and vice presidency. Prior to ratification of the Twenty-fifth Amendment in 1967, no constitutional provision existed for filling an intra-term vacancy in the vice presidency. As a result, when one occurred, the office was left vacant until filled through the next ensuing election and inauguration. Between 1812 and 1967, the vice presidency was vacant on sixteen occasions—as a result of seven deaths, one resignation, and eight cases in which the vice president succeeded to the presidency. Section 2 of