1789 . No parties existed, and no nominations were made.
1792 . Party lines began to be distinguished. Washington was unopposed for President but Federalist and Republican leaders informally advanced John Adams and George Clinton, respectively, for Vice-President.
1796 . An informal caucus of Republicans in Congress chose Thomas Jefferson and Aaron Burr. John Adams was acknowledged as the Federalist candidate for President and Thomas Pinckney was named for Vice-President. The lack of complete party unity among Federalist electors made Jefferson the Vice-President.
1800 . The Congressional caucus was now established in both parties. Adams was nominated for a second term, and Charles C. Pinckney was named as running mate. Republicans again chose Jefferson and Burr. The two Republi
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Publication information: Book title: Nominating the President:The Politics of Convention Choice, with a New Postscript on 1964. Contributors: Gerald Pomper - Author. Publisher: W. W. Norton. Place of publication: New York. Publication year: 1966. Page number: 279.