6 of the 54 seats in the Senate 27 seats needed for a majority
First party
Second party
Third party
Leader
Denham Henty
Don Willesee
Vince Gair
Party
Coalition
Labor
DLP
Leader's seat
Tasmania
Western Australia
Queensland
Seats before
30
27
2
Seats won
4
2
0
Seats after
29
28
2
Seat change
1
1
Popular vote
2,406,768
1,897,049
421,959
Percentage
50.04%
39.45%
8.77%
Swing
4.30pp
5.21pp
0.38pp
Special Senate elections were held on 26 November 1966 to elect members to fill casual vacancies in the Australian Senate for the states of New South Wales, Victoria, Queensland and Western Australia.
Prior to 29 July 1977, the filing of casual vacancies was complex. While senators were elected for a six-year term, people appointed to a casual vacancy only held office until the earlier of the next election for the House of Representatives or the Senate, at which the vacancy would be filled by the electors of the relevant state.[1]
This was one of the few occasions in which there was a special election for the Senate, as the House of Representatives and Senate elections had got out of synchronisation as a result of Robert Menzies calling an early House-only election in 1963.
Because of the loss of a seat in Western Australia, the Coalition held less than half of the seats in the chamber; the Democratic Labor Party and independent senator Reg Turnbull held the balance of power.
^Evans, H. "Filling Casual Vacancies before 1977, Volume 3" (PDF). The Biographical Dictionary of the Australian Senate. Retrieved 24 February 2017.
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