4, which is here given in full.

_The Twelfth Amendment._

_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 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 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 office of president
shall be eligible to that of vice-president of the United States._

Thus we see that the president may be elected in one of two ways--by
elec