to the office of President shall be eligible to that of Vice President of the United States". Nomination The vice presidential candidates of the major national political parties are formally selected by each party's quadrennial nominating convention, following the selection of the party's presidential candidate. The official process is identical to the one by which the presidential candidates are chosen, with delegates placing the names of candidates into nomination, followed by a ballot in which candidates must receive a majority to secure the party's nomination. In modern practice, the presidential nominee has considerable influence on the decision, and since the mid 20th century it became customary for that person to select a preferred running mate, who is then nominated and accepted by the convention. Prior to Franklin D. Roosevelt in 1940, only two presidents—Andrew Jackson in 1832 and Abraham Lincoln in 1864—had done so. In recent years, with the presidential nomination usually being a foregone conclusion as the result of the primary process, the selection of a vice presidential candidate is often announced prior to the actual balloting for the presidential candidate, and sometimes before the beginning of the convention itself. The most recent presidential nominee not to name a vice presidential choice, leaving the matter up to the convention, was Democrat Adlai Stevenson in 1956. The convention chose Tennessee Senator Estes Kefauver over Massachusetts Senator (and later president) John F. Kennedy. At the tumultuous 1972 Democratic convention, presidential nominee George McGovern selected Missouri Senator Thomas Eagleton as his running mate, but numerous other candidates were either nominated from the floor or received votes during the balloting. Eagleton nevertheless received a majority of the votes and the nomination, though he later resigned from the ticket, resulting in Sargent Shriver of Maryland becoming McGovern's final running mate; both lost to the Nixon–Agnew ticket by a wide margin, carrying only Massachusetts and the District of Columbia. During times in a presidential election cycle before the identity of the presidential nominee is clear, including cases where the presidential nomination is still in doubt as the convention approaches, campaigns for the two positions may become intertwined. In 1976, Ronald Reagan, who was trailing President Gerald Ford in the presidential delegate count, announced prior to the Republican National Convention that, if nominated, he would select Pennsylvania Senator Richard Schweiker as his running mate. Reagan was the first presidential aspirant to announce his selection for vice