Speaker of the United States House of Representatives by the President "pro tempore" of the Senate and by the heads of federal executive departments. To date, the implementation of the Presidential Succession Act has never been necessary and no Speaker has ever acted as President. Implementation of the law almost became necessary in 1973 after the resignation of Vice President Spiro Agnew. At the time, many believed that President Richard Nixon would resign because of the Watergate scandal, allowing Speaker Carl Albert to succeed to the Presidency. However, before he resigned, Nixon appointed Gerald Ford as Vice President in accordance with the Twenty-fifth Amendment. Nevertheless, the United States
Vice President of the United States Roosevelt's 1940 nomination, when he captured the ability to nominate his running mate instead of leaving the nomination to the convention. Prior to that, party bosses often used the vice presidential nomination as a consolation prize for the party's minority faction. A further factor potentially contributing to the rise in prestige of the office was the adoption of presidential preference primaries in the early 20th century. By adopting primary voting, the field of candidates for vice president was expanded by both the increased quantity and quality of presidential candidates successful in some primaries, yet who ultimately failed to capture the