Originally the person with the largest number of votes in the Electoral College became President and the person with the next largest number of votes became Vice-President. This resulted in the two main competitors becoming President and Vice-President. They were often of very different opinions and unable to work well together. The 12th Amendment established separate ballots for President and for Vice-President. No person running for President would then end up as Vice-President to his opponent. This has resulted in the Presidential Ticket, in which each party nominates one person for President and one for Vice-President, and a team from a single party is usually elected to office.
twelfth
The twelfth amendment of the Constitution is to provided the procedure of electing the President and Vice President.
Twelfth σ.σ (A+, Civics)
The Twelfth Amendment under the current party system guarantees that the president and vice president will be from the same party.
Electoral College