Nigel Farage vs. Count Binface: Britain’s very strange special election, explained

Voters in the British constituency of Clacton will have a bizarre choice to make when they cast their ballots in a special election on Thursday.

Do they lend their support to one of the U.K.’s most well-known but controversial political leaders — or to a self-described “intergalactic space warrior” with peculiar headgear that resembles a...