Premier Roger Cook has described Saturday’s Rockingham by-election as a “solid result”, despite a 33 per cent drop in Labor’s primary vote in the once ultra-safe seat for the Government. Speaking to reporters on Sunday after Labor’s Magenta Marshall retained the seat on Saturday night, Mr Cook said he would not take the electorate for granted. But an emboldened Liberal leader Libby Mettam, whose party candidate Peter Hudson saw a meagre 8 per cent rise in support, said the result had put the Premier on notice. The count on Sunday morning showed Labor’s Magenta Marshall just short of a majority of the primary vote, winning the seat with more than 65 per cent of the vote after preferences, a two party swing of more than 20 per cent against Labor. The WA Liberals received less than 18 per cent of the vote in the by-election caused by Mark McGowan’s shock decision to resign from parliament. The Premier said Labor did not take Rockingham, its safest seat where Mr McGowan received nearly 83 per cent of the primary vote in 2021, for granted. “Like I’ve always said we took nothing for granted in relation to Rockingham and that’s why we put forward a positive plan which focuses on the issues that concern people today,” he said. “This is a solid result for Labor and won of which we are very proud. “We knew that with any by-election, with its own unique set of circumstances and issues impacting on both the local state and national level, that it was always going to be tough. “The fact that we’ve produced such a solid result was obviously a great testament to the fact that we had a wonderful candidate in Magenta Marshall.” But Liberal leader Libby Mettam said her party, which holds just two seats in the lower house, could take “much encouragement” in one of the safest Labor seats in the country. “A huge swing against the Labor government, clearly the Premier is on notice,” she said. Ms Mettam dismissed concerns that her party’s primary vote had only grown by 8 per cent. “We can understand that for some in protesting against the Labor government it was too much to vote for the Liberal Party in one of the safest Labor seats in the country. But this is the best result for the Liberal Party in over a decade in WA Labor’s safest seat,” she said. “It’s still an improvement on 2017.” Liberal candidate Peter Hudson said forcing Labor to rely on preferences to win the seat for the first time since Mr McGowan was initially elected showed the people of Rockingham were “listening to the Labor government’s failures”. “The shambolic implementation of the Aboriginal Cultural Heritage Act is an example of some of the worst policy ever implemented in the WA parliament,” Mr Hudson said. “The people of Rockingham, with a strong Liberal voice in Rockingham will not take the inadequacies of the Cook Labor government.” But Ms Marshall said she never expected to receive the same result as Mr McGowan, given he had served for 26 years in the seat and that she was “really proud of the result”. “As many people have reminded me, I do have big shoes to fill on behalf of the Rockingham community,” she said. The Premier also rejected the claim his government had been put on notice, saying the Liberals “didn’t have a great night”. But he reiterated the call for humility that he made after polling published in The West showed WA Labor behind statewide. “That’s the instructions I’ve given to my team, my cabinet, my caucus. Listen, be humble, respond to people’s concerns,” Mr Cook said. “And make sure you put in place policies which matter to them.” Ms Marshall, 28 years old, will become the youngest member of parliament. “I think it’s really exciting to be the youngest member and the only member under 30 in the WA state parliament. I’m excited to bring lots of energy and enthusiasm to the parliament,” she said. Ms Marshall said she wanted to focus on education, job and sporting opportunities for young people in Rockingham and seeing through upgrades to Rockingham and Safety Bay High Schools and the Mike Barnett Sporting Complex. Her victory means there is an even number of men and women in parliament. Mr Cook said it was a “great reflection” on the WA parliament that it had achieved gender parity. Ms Mettam said she hoped Mr Hudson would be part of the Liberal team in the lead up to the 2025 election.