Shameless libel. Jefferson was as much of a dirtbag as his namesake.
Callender was Jefferson's poison pen against Hamilton and the Federalists for a price. The Jeffersonians according to Callender, had promised him a political sinecure. He thought he was getting paid off with the Richmond postmaster's job. He thought wrong.
Mr. Callender was to get his pound of flesh from Jefferson for the betrayal. It wasn't long after that when Callender informed a horrified nation that Jefferson was poking the unhired help. And the rest is history.