If Labour loses the Senedd seat, it will be a huge blow for party that has dominated politics in Wales for a century
When he steps out of the byelection campaign office opposite Caerphilly castle, the Plaid Cymru candidate, Lindsay Whittle, tends to hear a couple of different cries from passing motorists.
“Some of them shout: ‘Good luck Linds!’ I love that,” Whittle said. “It implies we’re old friends even though I may not know them personally.” Others are rather less positive. “They yell: ‘Stop the boats!’ You hear that all the time.