A polling has suggested that Labour is set to lose both its seats in Stoke and Copeland
The revelation means that Ukip leader Paul Nuttall appears to be on the verge of making an historic breakthrough in a Labour heartland seat of Stoke Central.
Mr Nuttall’s hope in Stoke – dubbed the capital of Brexit – have been boosted by a series of insults against Brexit supporters on Twitter by his Labour opponent Gareth Snell and revelations that his Tory opponent Jack Brereton campaigned for Remain.
Meanwhile Tory Copeland candidate Trudy Harrison appears to be set to be the first member of a governing party to win a by-election off the opposition since 1982.
The two by-elections on 23 February were called after Labour Copeland MP Jamie Reed resigned to take a job at Sellafield nuclear power station and his former colleague Tristram Hunt departed to be director of the V&A Museum.
Ukip leader Paul Nuttall's hope in Stoke has been boosted by insults against Brexit by his opponent
The defeats would be a massive blow for Jeremy Corbyn, whose hard Left leadership of Labour has seen the party split and led to moderate MPs refusing to serve in his shadow ministerial team.
I can represent the views of voters in Stoke Central better than my opponents who supported Remain
The party has also been plagued by splits with up to 80 MPs expected to oppose the will of the people on the referendum and try to block Brexit.
Sources close to Mr Nuttall have said that Tory voters switching in Stoke Central are key to him winning and that canvassing has suggested many are switching to Ukip.
However, Stoke also voted by 69.4 per cent in favour of Leave and many voters are understood to be angry by Remoaners trying to block Brexit.
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The defeat would be a massive blow for Jeremy Corbyn who has seen the party split
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Continued cooperation with the EU to tackle terrorism and international crime.
A senior Labour source said: “The polling is not looking good for us but there are still a few weeks to turn it around.”
Hopes for Tory candidate Mr Brereton evaporated when he admitted he was on the wrong side of history in the referendum.
He said: "I voted Remain and I've been open and honest about that because – um – but we need to get beyond that, it's about now delivering Brexit."
Meanwhile a series of offensive emails from Mr Snell, Labour’s Stoke Central candidate, on 22 June ahead of the historic vote suggested that almost 70 per cent of the constituents were “racist”, “inward looking” and “confused”.
Stoke voted 69.4 per cent in favour of Leave and has been dubbed the capital of Brexit
Mr Snell who described Brexit as “a pile of sh**” also Tweeted in December that for Leave supporters “the important part will be white Brexit” in an attempt to paint them as racists.
Mr Nuttall told the Daily Express: “We are getting an excellent response on the doors.
“We are not taking anything for granted and this will be a tough battle but I know that I can represent the views of voters in Stoke Central better than my opponents who supported Remain.”
After taking over from Nigel Farage as Ukip leader in November he promised to make it “the party of the patriotic working class”.
He also told the Express that a win in Stoke could “open the floodgates” for the party to win seats in the north of England and Midlands.