Such was the method devised by the framers of the Constitution for filling the executive office. Experience has required some changes to be made in it. It has been found that to require the electors to designate the persons for whom they vote as the President and Vice-President, respectively, has a tendency to secure a choice by the electoral votes, and therefore to prevent the election from being thrown into the House of Representatives; and it has also been deemed expedient, when the election has devolved on the House of Representatives, to confine the choice of the States to the three highest candidates on the list returned by the electors. These changes were made by the twelfth of the amendments to the Constitution, adopted in the year 1804, which also provides that the person having the greatest number of the electoral votes for President shall be deemed to be chosen by the electors, if such number be a majority of the whole number of electors appointed. If a choice is not made by the electors, or by the House of Representatives, before the fourth day of March next following the election, the amendment declares that the Vice-President shall act as President, "as in the case" (provided by the Constitution) "of the death or other constitutional disability of the President." In the appointment of the Vice-President, the amendment has also introduced some changes. The person having the greatest number of the electoral votes as Vice-President, if the number is a majority of all the electors appointed, is to be the Vice-President; but if no choice is thus effected, the Senate are to choose the Vice-President from the two highest candidates on the list returned by the electors; but a quorum for this purpose is to consist of two thirds of the whole number of senators, and a majority of the whole number is made necessary to a choice. The amendment further adopts the same qualifications for the office of Vice-President as had been established by the Constitution for the office of President.[330]