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
Spiro Agnew bolstering Nixon's support in suburbs nationally. Had Nixon lost those five states, he would have had only the minimum number of electoral votes needed, 270, and any defection by an elector would have thrown the election to the Democrat-controlled House of Representatives. Immediately after the 1968 election, Agnew was still uncertain what Nixon would expect of him as vice president. He met with Nixon several days after the election in Key Biscayne, Florida. Nixon, vice president himself for eight years under Eisenhower, wanted to spare Agnew the boredom and lack of a role he had sometimes experienced in that office.