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Name of PR System
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How is a casual vacancy filled?
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Commonwealth Senate
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Senate System
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The new member is chosen by the relevant State/Territory Parliament.
If the vacating Member was endorsed by a political party at the
time of election, the replacement must if possible be a member of
the same party.
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NSW Legislative Council
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Optional preferential proportional representation
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The new member is elected at a joint sitting of Upper and Lower
Houses.
Generally nominations are limited to the party for which the member
vacating the seat was elected.
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Western Australia Legislative Council
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Proportional Representation
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The new Member is chosen by recount.
If a recount is not practicable, or if there is no available consenting
candidate from the party of the vacating member, a by-election may
be held for the vacant position.
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South Australia Legislative Council
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Modified Hare-Clark
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The new Member is chosen by an assembly of both Houses of Parliament.
If the vacating Member was endorsed by a political party at the
time of the election, the replacement must if possible be nominated
by the same party.
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Tasmania House of Assembly
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Hare-Clark
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The new Member is chosen by recount.
If a recount is not practicable, or if there is no available consenting
candidate from the party of the vacating member, a by election may
be held for the vacant position.
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Australian Capital Territory Legislative
Assembly
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Hare-Clark
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The new Member is chosen by recount.
If a recount is not practicable, the Legislative Assembly shall
choose a replacement as follows.
If the vacating Member was endorsed by a political party at the
time of election, the replacement must if possible be nominated
by the same party. Otherwise the person chosen cannot have been
a member of a political party during the preceding 12 months.
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