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The Empty Chair
I seem to remember reading about it in Robert Heinlein's Take Back Your Government, written in 1947, but published posthumously in 1992.
There's an entry on it in Safire's Political Dictionary, where Safire discusses a 1966 incident in which Frank O'Connor, Jacob Javits's opponent, threatened to pull the "empty chair" trick on Javits, who was wrangling over debate terms. Javits's representative
"shook his head. “That’s against FCC regulations,” he said with a straight face. “This is a four-man race. You’d have to debate three empty chairs.”
Since most of the people complaining about it are leftwing progressive types at the Daily Kos, here's one classic use of it: