to elect Pinckney over Adams by convincing Jefferson electors from South Carolina to cast their second votes for Pinckney. Hamilton did prefer Adams to Jefferson, and urged Federalist electors to cast their votes for Adams and Pinckney. Democratic-Republican candidates The Democratic-Republicans united behind former Secretary of State Thomas Jefferson, who had co-founded the party with James Madison and others in opposition to Hamilton's policies. Congressional Democratic-Republicans sought to also unite behind one vice-presidential nominee. With Jefferson's popularity strongest in the South, many party leaders wanted a Northern candidate as Jefferson's running mate. Popular choices included Senator Pierce Butler of South Carolina and three New Yorkers: Senator Aaron Burr, Chancellor Robert R. Livingston, and former Governor George Clinton. A group of Democratic-Republican leaders met in June 1796 and agreed to support Jefferson for president and Burr for vice president. Results Tennessee was admitted into the United States after the 1792 election, increasing the Electoral College to 138 electors. Under the system in place before the 1804 ratification of the Twelfth Amendment, electors were to cast votes for two persons for president; the runner-up in the presidential race was elected vice president. If no candidate won votes from a majority of the Electoral College, the House of Representatives would hold a contingent election to select the winner. Each party intended to manipulate the results by having some of their electors cast one vote for the intended presidential candidate and one vote for someone besides the intended vice-presidential candidate, leaving their vice-presidential candidate a few votes shy of their presidential candidate. But all electoral votes were cast on the same day, and communications between states were extremely slow at that time, making it very difficult to coordinate which electors were to manipulate their vote for vice president. Additionally, there were rumors that Hamilton had coerced southern electors pledged to Jefferson to give their second vote to Pinckney in hope of electing him president instead of Adams. Campaigning centered in the swing states of New York and Pennsylvania. Adams and Jefferson won a combined 139 electoral votes from the 138 members of the Electoral College. The Federalists swept every state north of the Mason-Dixon line except Pennsylvania, though one Pennsylvania elector voted for Adams. The Democratic-Republicans won the votes of most Southern electors, but the electors of Maryland and Delaware gave a majority of their votes to Federalist candidates, while North Carolina and Virginia