<P> To rectify the flaw in the original presidential election mechanism, the Twelfth Amendment, ratified in 1804, was added to the United States Constitution . It called for electors to make a distinct choice between their selections for President and Vice President . </P> <P> The result of this election was affected by the three - fifths clause of the United States Constitution, by which slaves were counted as three - fifths of a person for the purpose of Congressional apportionment . Historians such as Garry Wills, Leonard L. Richards, and William W. Freehling have written that had slaves not been counted at all, Adams would have won the electoral vote . Jefferson was subsequently criticized as having won "the temple of Liberty on the shoulders of slaves". Akhil Reed Amar, a law and political science professor at Yale, argued that the election was a turning point in American history and claimed that "in a direct election system, the South would have lost every time ." </P> <Ul> <Li> <P> Vice President Thomas Jefferson from Virginia (D-R) </P> </Li> <Li> <P> Former U.S. Senator Aaron Burr from New York (D-R) </P> </Li> <Li> <P> President John Adams from Massachusetts (Federalist) </P> </Li> <Li> <P> Former Minister to France Charles C Pinckney from South Carolina (Federalist) </P> </Li> </Ul> <Li> <P> Vice President Thomas Jefferson from Virginia (D-R) </P> </Li>

Who was running in the election of 1800