James Cracknell, who is standing to be a Conservative MP, has called the Tories a “shower of shit”, in a video he posted on Facebook.

The former Olympic rower, who is the Conservative candidate for the key Labour target of Colchester, said: “Two weeks out from the Olympics, if we are competing against the Conservative party my teammates and I would be saying they are a shower of shit.

“And if one of my teammates got caught for cheating they’d be dead to me. That abuse of trust is unforgivable.”

Cracknell is competing to retain the seat, which had a majority of more than 9,000 under the previous MP, Will Quince, but polls indicate it is likely to be won by Labour for the first time since 1945.

He said he was still fighting for the seat because he believed in the party’s values. “Why am I still canvassing and delivering leaflets? Because I believe the Conservative way is the best for the country. Freedom to succeed, protection of our national security and personal responsibility.”