Background
Coalition arrangements are facilitated by Australia's preferential voting systems which enable Liberals and Nationals to compete locally in "three-cornered-contests", with the Australian Labor Party (ALP), while exchanging preferences in elections. Such contests would weaken their prospects under first past the post voting. From time to time, friction is caused by the fact that the Liberal and National candidates are campaigning against each other, usually without undue long-term damage to the relationship.
Indeed, the whole point of introducing preferential voting was to allow safe spoiler-free three-cornered contests. It was a government of the forerunner to the modern Liberal party that introduced the necessary legislation, after Labor won the 1918 Swan by-election when the conservative vote was split in two. Two months later, a by-election held under preferential voting caused the initially leading ALP candidate to lose after some lower-placed candidates' preferences had been distributed.
As a result of variations on the preferential voting system used in every state and territory, the Coalition has been able to thrive, wherever both its member parties have both been active. The preferential voting system has allowed the Liberal and National parties to compete and cooperate at the same time. By contrast, a variation of the preferential system known as Optional Preferential Voting has proven a significant handicap to coalition co-operation in Queensland and New South Wales, because significant numbers of voters don't express all useful preferences.
Read more about this topic: Coalition (Australia)
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