In a leaflet promoting the Progressive Party at the 1892 London County Council election, Baron Arthur Hobhouse called on Londoners to:
Shake off the sloth with which you are reproached in public matters, and which makes your friends despair of you, and your enemies despise you. Come to the polls and exercise your rights as free men in favour of the freedom and power of London.
Despite that backhanded compliment, the Progressive Party won by a landslide.
Perhaps Boris and Ken are missing a trick? Is the best way to win support to insult the voters?