Gerwyn Price, a 40-year-old darts star, has become the first to back the Reform Party.
Price had urged people to vote for Llyr Powell, but the candidate lost to Plaid Cymru's Lindsay Whittle in a local by-election.
The results showed the Welsh party with 47% of the vote, Reform with 36%, and Labour losing the seat with 11% of the vote.
Don't just sit back and wait for the result, make a difference and vote Reform UK Wales
Price first hinted at his support for Reform in July by changing his Facebook profile picture to the party's logo.
Author's summary: Gerwyn Price supports Reform Party.