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I was a little fuzzy on it. FWIF (from wiki)

Original election process and reform

Under the original terms of the Constitution, the electors of the Electoral College voted only for office of president rather than for both president and vice president. Each elector was allowed to vote for two people for the top office. The person receiving the greatest number of votes (provided that such a number was a majority of electors) would be president, while the individual who received the next largest number of votes became vice president. If no one received a majority of votes, then the House of Representatives would choose among the five candidates with the largest numbers of votes, with each state’s representatives together casting a single vote. In such a case, the person who received the highest number of votes but was not chosen president would become vice president. In the case of a tie for second, then the Senate would choose the vice president.[27]
The original plan, however, did not foresee the development of political parties and their adversarial role in the government. For example, in the election of 1796, Federalist John Adams came in first, but because the Federalist electors had divided their second vote amongst several vice presidential candidates, Democratic-Republican Thomas Jefferson came second. Thus, the president and vice president were from opposing parties. Predictably, Adams and Jefferson clashed over issues such as states’ rights and foreign policy.[28]
A greater problem occurred in the election of 1800, in which the two participating parties each had a secondary candidate they intended to elect as vice president, but the more popular Democratic-Republican party failed to execute that plan with their electoral votes. Under the system in place at the time (Article II, Section 1, Clause 3), the electors could not differentiate between their two candidates, so the plan had been for one elector to vote for Thomas Jefferson but not for Aaron Burr, thus putting Burr in second place. This plan broke down for reasons that are disputed, and both candidates received the same number of votes. After 35 deadlocked ballots in the House of Representatives, Jefferson finally won on the 36th ballot and Burr became vice president.[29]
This tumultuous affair led to the adoption of the Twelfth Amendment in 1804, which directed the electors to use separate ballots to vote for the president and vice president.[20] While this solved the problem at hand, it ultimately had the effect of lowering the prestige of the vice presidency, as the office was no longer for the leading challenger for the presidency.
The separate ballots for president and vice president became something of a moot issue later in the 19th century when it became the norm for popular elections to determine a state’s Electoral College delegation. Electors chosen this way are pledged to vote for a particular presidential and vice presidential candidate (offered by the same political party). So, while the Constitution says that the president and vice president are chosen separately, in practice they are chosen together.
If no vice presidential candidate receives an Electoral College majority, then the Senate selects the vice president, in accordance with the United States Constitution. The Twelfth Amendment states that a “majority of the whole number” of Senators (currently 51 of 100) is necessary for election.[30] Further, the language requiring an absolute majority of Senate votes precludes the sitting vice president from breaking any tie which might occur.[31] The election of 1836 is the only election so far where the office of the vice president has been decided by the Senate. During the campaign, Martin Van Buren’s running mate Richard Mentor Johnson was accused of having lived with a black woman. Virginia’s 23 electors, who were pledged to Van Buren and Johnson, refused to vote for Johnson (but still voted for Van Buren). The election went to the Senate, where Johnson was elected 33-17.