In 2007 the Australian Labor Party, under Kevin Rudd, inflicted a painful defeat on the COALition. From 60 MPs the ALP had before the federal election, their Lower House representation swelled to 83 (more than enough to pass legislation). And 22 of those new MPs were replacing defeated COALition MPs, whose House contingent was reduced to 65.
To make things worse for the COALition, even John Howard, until then PM, lost his safe seat of Bennelong and “moderate” Malcolm Turnbull, who soon was chosen federal Opposition Leader, was facing an extreme Right insurgency, led by Tony Abbott and Nick Minchin.
In the Senate, things were only slightly less favourable for Rudd, the new Labor PM:
Why the difference in results? Because in Australia, normally only half the Senate seats are contested each election. So, perhaps Labor could have done much better in the Senate, but only half its seats were in dispute. (It would have taken a
double dissolution for all Parliament seats to be contested).