Twelfth Amendment to the United States Constitution
The 1800 Presidential election showed the deep problems in the electoral college system. Jefferson ran against Adams again. Both had running mates. Pinckney was again the running mate of Adams for the Federalist Party. Aaron Burr was Jefferson's running mate for the Democratic-Republican Party. Jefferson and Burr received the same number of votes creating a tie between two candidates from the same political party. Under the Constitution, the matter was to be decided by the House of Representatives. In the House, the two tied again in 35 votes. Only on the 36th ballot was the deadlock broken and Jefferson was elected president.