Anti-Brexit campaigner Steve Bray is to stand for the Liberal Democrats at the next general election.
The activist has gained notoriety in Westminster for appearing in the background of news broadcasts shouting "Stop Brexit" while wearing a bright blue hat and Union Jack cape.
Mr Bray - a former rare coins dealer - will stand for the party in the Welsh seat of Cynon Valley, previously held by Labour.
He said he plans to swap his "blue EU hat for a yellow one" as a result of party leader Jo Swinson's pledge to stop Brexit.
Ms Swinson said the 50-year-old pro-EU campaigner should not be seen as a joke candidate.
"He is somebody who is true to his values and cares very deeply," she said.
"I think we do want to have our politicians care about the issues that they are addressing. I think Steve is an example of somebody who very clearly does just that."
Labour's Ann Clwyd previously held the Cynon Valley seat, winning with a majority of around 13,000 in 2017, but has decided not to run for election this year.
Plaid Cymru came third in the seat in the 2017 election, and have selected their candidate to fight for it on December 12.
In previous elections Mr Bray said he had voted for Labour, the Liberal Democrats, and once for the Conservatives and he admitted he faced a challenge to take the seat from Labour.
"As much as I hate to say it, another referendum would just leave divisions," he added.
"If that's what it takes, so be it, but I would rather they put a stop to it at Parliament and they revoke Article 50."
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