How the new Senate Electoral System Performed at its first Half-Senate Election test.

The Turnbull government’s changes to the Senate’s electoral system were first used at the 2016 double dissolution election, but the 2019 half-Senate election was always going to be a truer test of the changes.

Several of the minor party Senators elected in 2016 owed their seats to the lower 7.7% quota used for double dissolution elections. Two-thirds of minor party Senators were elected to the final vacancies in each state and were allocated to short term seats post-election. Those Senators faced re-election in 2019 when their chances of re-election would be made tougher by the 14.3% quota used at half-Senate elections, as well as the new electoral system.

As this post will explain, the new system worked as designed at the 2019 election, rewarding parties that polled well on first preferences, and disadvantaging parties that relied of harvesting preferences to win election.
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