A narrow win for Labor in retired Premier Mark McGowan’s stronghold of Rockingham has heaped further doubt on the chances of the Government retaining the Augusta-Margaret River seat of Warren-Blackwood. Labor candidate Magenta Marshall relied on preferences to get across the line in the traditionally safe seat due to a 22.5 per cent swing against the reigning party. Analysis showed the swing would be enough to reduce Labor to 30 seats in the Parliament — the minimum required to govern. It also undermines the re-election chances for Labor newcomer Jane Kelsbie, who was among a swag of candidates who claimed Lower House seats and shocked incumbents in 2021. Ms Kelsbie snagged Warren-Blackwood from 11-year Nationals veteran and former party leader Terry Redman but now faces an uphill battle to retain it. Despite working hard in her electorate — which faces a significant boundary shake-up as part of a WA Electoral Commission review — Ms Kelsbie and her colleagues were “now on notice,” according to Liberal Party leader Libby Mettam. Ms Mettam, whose party had a meagre 8 per cent rise in the primary vote, said the result was significant. Speaking to reporters on Sunday after the by-election, Premier Roger Cook declared it was “back to work” for his team, stressing the Government needed to listen to the community. Responding to inquiries from the Times, Ms Kelsbie claimed Rockingham “overwhelmingly endorsed” Ms Marshall and the plans and policies of her “strong campaign”. “The Cook Labor Government is here to listen and to help and I will be working hard for my electorate right up until election day in March 2025,” she said. Meanwhile, Opposition allies have confirmed they will both make a play for Warren-Blackwood. Nationals leader Shane Love said work had already started with an eye to 2025. “Our party looks forward to selecting a local champion for Warren-Blackwood that listens to the community and protects local jobs in the region,” he said. “This by-election result is a strong indication that Roger Cook and the WA Labor Government are failing the people of WA. “In the safest seat in the State, voters put WA Labor on notice that their Government’s poor performance under Roger Cook has resulted in an electoral backlash.” Ms Mettam downplayed the by-election result and said “there is still a great deal of work to be done”. “The 30 per cent plunge in the WA Labor primary vote is a clear message that West Australians are fed up with being taken for granted,” the member for Vasse said. “Peter Hudson was an outstanding candidate for Rockingham (for the Liberal Party) and the party will continue to build a strong team of candidates for all seats across the State, including Warren-Blackwood.” Despite the Libs mostly coming second to their Opposition partners in the South West seat, Ms Mettam said the Liberal campaign would focus on common issues affecting West Australians.