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Amendment XII

The Electors shall meet in their respective states, and vote by ballot for
President and Vice-President, one of whom, at least, shall not be an
inhabitant of the same state with themselves; they shall name in their
ballots the person voted for as President, and in distinct ballots the person
voted for as Vice-President, and they shall make distinct lists of all
persons voted for as President, and of all persons voted for as
Vice-President and of the number of votes for each, which lists they shall
sign and certify, and transmit sealed to the seat of the government of the
United States, directed to the President of the Senate; 

The President of the Senate shall, in the presence of the Senate and House of
Representatives, open all the certificates and the votes shall then be
counted; 

The person having the greatest Number of votes for President, shall be the
President, if such number be a majority of the whole number of Electors
appointed; and if no person have such majority, then from the persons having
the highest numbers not exceeding three on the list of those voted for as
President, the House of Representatives shall choose immediately, by ballot,
the President. But in choosing the President, the votes shall be taken by
states, the representation from each state having one vote; a quorum for this
purpose shall consist of a member or members from two-thirds of the states,
and a majority of all the states shall be necessary to a choice. And if the
House of Representatives shall not choose a President whenever the right of
choice shall devolve upon them, before the fourth day of March next
following, then the Vice-President shall act as President, as in the case of
the death or other constitutional disability of the President. 

The person having the greatest number of votes as Vice-President, shall be
the Vice-President, if such number be a majority of the whole number of
Electors appointed, and if no person have a majority, then from the two
highest numbers on the list, the Senate shall choose the Vice-President; a
quorum for the purpose shall consist of two-thirds of the whole number of
Senators, and a majority of the whole number shall be necessary to a choice.
But no person constitutionally ineligible to the office of President shall be
eligible to that of Vice-President of the United States.