<P> Adams had narrowly defeated Jefferson in the 1796 election . Under the rules of the electoral system that were in place prior to the 1804 ratification of the 12th Amendment, each member of the Electoral College cast two votes, with no distinction made between electoral votes for president and electoral votes for vice president . As Jefferson received the second-most votes in 1796, he was elected vice president . In 1800, unlike in 1796, both parties formally nominated tickets . The Democratic - Republicans nominated a ticket consisting of Jefferson and Aaron Burr, while the Federalists nominated a ticket consisting of Adams and Charles Pinckney . Each party formed a plan in which one of their respective electors would vote for a third candidate or abstain so that their preferred presidential candidate (Adams for the Federalists and Jefferson for the Democratic - Republicans) would win one more vote than the party's other nominee . </P> <P> The chief political issues revolved around the fallout from the French Revolution and the Quasi-War . The Federalists favored a strong central government and close relations with Great Britain . The Democratic - Republicans favored decentralization to the state governments, and the party attacked the taxes imposed by the Federalists . The Democratic - Republicans also denounced the Alien and Sedition Acts, which the Federalists had passed to make it harder for immigrants to become citizens and to restrict statements critical of the federal government . While the Democratic - Republicans were well organized at the state and local levels, the Federalists were disorganized and suffered a bitter split between their two major leaders, President Adams and Alexander Hamilton . According to historian John Ferling, the jockeying for electoral votes, regional divisions, and the propaganda smear campaigns created by both parties made the election recognizably modern . </P> <P> At the end of a long and bitter campaign, Jefferson and Burr each won 73 electoral votes, Adams won 65 electoral votes, and Pinckney won 64 electoral votes . The Federalists swept New England, the Democratic - Republicans dominated the South, and the parties split the Mid-Atlantic states of New York, New Jersey, and Pennsylvania . The Democratic - Republicans' failure to execute their plan to award Jefferson one more vote than Burr resulted in a tie, which necessitated a contingent election in the House of Representatives . Under the terms laid out in the Constitution, the outgoing House of Representatives chose between Jefferson and Burr . Each state delegation cast one vote, and a victory in the contingent election required one candidate to win a majority of the state delegations . Neither Burr nor Jefferson were able to win on the first 35 ballots of the contingent election, as most Federalist Congressmen backed Burr and all Democratic - Republican Congressmen backed Jefferson . Hamilton personally favored Jefferson over Burr, and he convinced several Federalists to switch their support to Jefferson, giving Jefferson a victory on the 36th ballot of the contingent election . The result of this election was affected by the three - fifths clause of the United States Constitution; historians such as Garry Wills have noted that had slaves not been counted for the purposes of congressional apportionment, Adams would have won the electoral vote . </P> <P> Both parties used congressional nominating caucuses to formally nominate tickets for the first time . The Federalists nominated a ticket consisting of incumbent President John Adams of Massachusetts and Charles Cotesworth Pinckney of South Carolina . Pinckney had fought in the American Revolutionary War and later served as the minister to France . The Democratic - Republicans nominated a ticket consisting of Vice President Thomas Jefferson of Virginia and former Senator Aaron Burr of New York . Jefferson had been the runner - up in the previous election and had co-founded the party with James Madison and others, while Burr was popular in the electorally important state of New York . </P>

Who decided the election of 1800 since it ended up in a deadlock