Tactical voting is a matter for voters, not for parties.
UKIP ought to bear that it mind as it gallantly stands aside for a party that is arranging safe seats in the Commons for its pro-Remain MEPs, but which is refusing to shortlist their pro-Leave colleagues.
In fact, rather a lot of people need to ponder that one, along with David Cameron's fairly breezy assertion yesterday that Theresa May needed a large majority in order to avoid Hard Brexit. She has not corrected him.
Meanwhile, here in North West Durham, the Conservative candidate, Sally-Ann Hart, resides in Sussex, while the Labour candidate, Laura Pidcock, has somehow acquired an address in Lanchester during the week between her loss of her seat on Northumberland County Council and the close of nominations for this election.
Ms Pidcock was imposed, using an all-women shortlist, by the National Executive Committee of the Labour Party, with no local involvement whatever.
The Green candidate lives in Durham City, while the UKIP candidate lives in Bishop Auckland. I am not aware that either of them has played any role in the Teaching Assistants' campaign.
But Labour voters deserve a chance to return the contempt that the Labour Party has shown them by treating this seat as a consolation prize for Laura Pidcock, whose own MP has not retired as expected.
And everyone else deserves the chance to take this seat out of the hands of the Labour Party, including the chance for Conservative voters to return the contempt that their party has shown them by yet again failing to field a local candidate.