Callis was an elector from Virginia in Washington's unanimous election to a second term in 1793. Until 1800, each elector had two votes. Callis voted with all the other electors unanimously using one vote for Washington. His second vote went for Republican George Clinton of New York as did the other electors from Virginia. Washington won president with 132 votes, but Clinton came in third with 50 votes behind Federalist John Adams (77 votes), who became vice president. George Clinton later became Governor of New York (1777) and ultimately become VP (1805–1812) under both Jefferson and Madison.