If we needed any more evidence that the Coalition’s political stocks were tanking, the prospect of three leadership changes in two weeks might be it.

The federal opposition leader, Sussan Ley, is under extreme pressure ahead of the last parliamentary sitting week of the year, while Victoria’s Liberal leader, Brad Battin, was rolled in his party room on Tuesday. In New South Wales, Mark Speakman appears to be on borrowed time.

Battin, the first of the group to fall, has been replaced by first-term MP Jess Wilson, a year out from a state election where the Labor premier, Jacinta Allan, faces her first major test with voters.

While Liberals in Canberra stress a challenge against Ley is not imminent,........

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