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A Tory candidate accused Theresa May of having “f****d up” the election campaign in a blistering four-letter tirade.

It came as a shock YouGov poll revealed the Conservatives could lose 20 seats on June 8, destroying the PM’s 16-strong majority.

The survey allowed a wide a margin for error and said the Tory seats could vary between 274 on a bad night and 345 on a good night.

The unnamed Tory said: “I’m f****d off. People say on the doorstep: “She’s going after pensioners, she doesn’t know what she’s doing and doesn’t answer questions.”

(Image: Peter Nicholls/Reuters) (Image: EPA)

“It’s hard to understand how people in London who get paid a lot of money made such a clusterf***.

“It’s totally shattered the confidence of the parliamentary party. Colleagues up and down the country are just f***** off. She said she wasn’t going to call a general election, and they’ve totally f****d it up.

“If you were going to write what not to do in a campaign, running it on ‘strong and stable’ and changing your mind on everything would be it.”

The Tory added on Huffington Post: “People are now beginning to vote for Jeremy Corbyn .”