The phrase "election disaster" means a situation where an election does not go well and there are significant problems or negative outcomes associated with it. Full definition
A new poll suggests Labour and the Liberal Democrats are both facing potential general election disaster in Scotland. (itv.com)
Parties can recover quite happily from local election disasters as Labour is now demonstrating after its catastrophic demolition in 2009. (politics.co.uk)
On July 17, after a series of election disasters, the Telegraph turned on the Tory parliamentary party with venom. (theguardian.com)