The Twelfth Amendment changed the way the president and vice president were chosen under Article II. Originally, the electoral college voted for two people on the same ballot, without distinguishing between offices. The person who received the most electoral votes became president; the runner-up was vice president. But the advent of political parties, and a tie in the electoral college, prompted Americans to adopt the Twelfth Amendment in 1804 to create separate balloting for the president and the vice president.