That she is able to do so, shows that the Prime Minister has successfully renewed the Conservative brand, and is building the foundations for a thumping victory in 2020.
Conservative Trudy Harrison scored a spectacular victory in Copeland on Friday morning, taking the seat from Labour for first time since the 1930s, with a majority of 2,147.
Copeland had been held by Labour for more than 80 years - the Tories' Trudy Harrison won with 13,748 votes to Labour's Gillian Throughton's 11,601.
In her victory speech, Harrison said: "It's been very clear talking to people throughout this campaign that Jeremy Corbyn doesn't represent them".
However, his anti-Trident stance is at odds with the Labour-supporting unions, who say any move to not replace Trident will lead to the loss of thousands of jobs, with the Labour Party claiming 19,000 jobs depending on Trident in Scotland alone.
"This is a quite exceptional result and while there are particular factors (Copeland is home to the Sellafield nuclear plant) we simply should not be losing seats like this".
However all was not lost for Labour as it fended off a challenge from the anti-immigration, pro-Brexit U.K. Independence Party (UKIP) in the northern city of Stoke-on-Trent, which is has held since 1950.
He went on: "Corbyn is the leader of the Labour party, so while he should not be held exclusively responsible for Labour's downturn, he must now take responsibility for turning things around". "But we are in trouble as a party", he told the BBC. Lisa Nandy, who left the party's front bench last summer, is the MP for Wigan and has long anxious about the disconnect between Labour MPs and the towns they represent.
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Asked whether he might be the problem, Mr Corbyn said: "No".
A senior member of Jeremy Corbyn's top team has urged him to listen to the public and not shy away from "painful conclusions" of the "devastating" Copeland by-election result.
Conservative support in the seat was up 8.5 per cent on the General Election and if mirrored across the country would send the Conservative majority to around 100.
"Labour's local branches are changing", the PM said.
UKIP finished with 24.72% of the vote, just ahead of the Conservatives' Jack Brereton on 24.35%.
But she did not think the leadership of the party was the issue: "I do not think you can blame Jeremy Corbyn for what happened in Copeland". I wish her well in that. May's Conservatives won the district for the first time since its creation in 1983 - an achievement all the more remarkable because it's exceptionally rare for British governing parties to gain seats in such special elections.
The loss of Copeland - a seat Labour has held for decades - is a sign of how far the political landscape in the United Kingdom has shifted after Britain's move to leave the EU.
"What's important now is discussing the whole thing and what happened in Copeland". Hunt, Labour's former shadow education secretary, was once considered a potential party leader but fell out of favour and quit to run the V&A Museum in London instead.