Labour has held on to its seat in West Lancashire after a by-election victory which saw Ashley Dalton become the country’s newest MP.
Ms Dalton secured a majority of 8,326 over Conservative candidate Mike Prendergast, with a 10.52% swing from the Tories to Labour.
In her victory speech, she said the people of her constituency have spoken on “behalf of the country” and sent a message to the Conservative government that they “do not have confidence in them to govern or the prime minister to lead”.
She added that these are “testing times for our country” with the cost of living crisis, as she told the Conservatives to “move out of the way and let Labour take over”.
The result marked the third by-election victory for Labour in recent months.
In December, Labour comfortably held on to its seat in Stretford and Urmston, Greater Manchester, with a 10.5% swing from Conservatives to Labour.
The victory came just two weeks after a successful result in Chester, when Samantha Dixon held the seat for Labour with an increased majority of some 11,000 over the Tories.
Ms Cooper, 72, resigned in November to become chairwoman of the Mersey Care NHS Foundation Trust.
The MP was the victim of a plot to kill her by an alleged member of the banned neo-Nazi group National Action and admitted the stress of what happened had “taken its toll”.
Sir Keir Starmer sent his congratulations to Ms Dalton following her comfortable victory.
“Ashley, I look forward to working with you,” the party leader said.
“The message from West Lancashire today is clear – after 13 years of Tory decline, it’s time for a Labour government.”
Shadow chancellor Rachel Reeves also praised the “strong swing, double-digit swing, to the Labour Party”.
“Voters there are sending a clear message to Rishi Sunak and his government that frankly they are no longer fit to govern and people want a general election and a choice now about who is in government because this government have run out of ideas and they’ve run out of road,” she said.
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West Lancashire has been a Labour stronghold since 1992 when Colin Pickthall took the seat from Tory MP Ken Hind, who had held it since 1983.
Although winning with an increased majority in 2015 and 2017, Ms Cooper saw her majority drop in 2019.
West Lancashire separates Liverpool, a historically Labour-supporting area, and the Conservative-held seats of South Ribble, Southport and Bolton West.
The constituency has a mix of rural and urban areas while its largest town, Skelmersdale, has relatively high levels of deprivation compared with the neighbouring towns of Aughton and Ormskirk, which are considered relatively wealthy.