Canningites were a faction of British Tories in the first decade of the 19th century through the 1820s who were led by George Canning.
Canning died in August 1827 and the Canningite Lord Goderich became Prime Minister, but his government collapsed in January 1828.
They resigned in May 1828, though, on the issue of allocating seats from disenfranchised corrupt boroughs to the new growing cities of England.
After Huskisson died in 1830 (in a railway accident, the first recorded casualty of this new form of transport), the remainder of the group decided to join the Whigs and voted against the Tory government in a parliament in favour of electoral reform.
Wellington resigned as prime minister and the surviving Canningite/Huskissonites joined the new Whig cabinet of Earl Grey in November 1830.