The muzzies that have taken over London.
London is dead!
London is dead!
London is dead!
London is dead!
London is dead!
-Morrissey
Khan has won again because he's the official Labour candidate, and Labour has usually had a small overall majority. On each of his three wins he's also been challenged by poor Conservative opponents fighting weak campaigns - this time the weakest of the lot. He's concentrated on London-specific issues, rather than using the mayoralty as a platform for a national political profile (in contrast to his predecessor). He's always been able to present himself as a Londoner who has lived and worked in the City his entire life (father a London bus driver), again unlike his opponents.
He's always been a hate figure for the Murdoch and Rothermere press (who were responsible for the notorious 'part and parcel' misquotation), but among ordinary Londoners he seems quite popular.
True. London is a cesspool of Muslims.