Shechemite
Be the sun and all will see you
It can be used to remind them how wrong they were - I don't think it says anything about how useless they are though. They were wrong to point at the polls and say 'anyone else would be 20 points ahead'. You're wrong to point at the polls and say 'this proves you're useless'. The times are unprecedented, and the polls can't be trusted to say anything right now except how the population is feeling about the pandemic.
Just about the pandemic? Nothing longer term that has made the Labour Party unappealing?