This is a poll of the UK public in general, not the people of Clacton, so it doesn't show that Binface is leading in Clacton. But it's interesting that the British public prefer Binface to Farage.
Denmark had a joke candidate who won a term in parliament 1994-1998: Jacob Haugaard.
He ran representing the Party of Intentionally Workshy Elements (slogan: If Employment is Healthy, Give it to the Sick), on a programme of:
When he got in he was clearly terrified, but over time he did participate and take part. I don’t think he could quite believe it.
I loved his parting shot, after his term ended, when his portrait (like that of all MPs) was hung in Parliament and he said: “Let this serve as a warning that any idiot populist can get elected”.