Tony Travers, a local government expert from the London School if Economics, says it's looking even closer for the mayoral election.
In the previous run-offs, second preference votes haven't altered the outcome. Mr Travers thinks this time round they could.
If Siobhan Benita has taken votes from Ken Livingstone, Ken could win her second votes.
The race isn't over yet.
Boris Johnson said he would "definitively, categorically, emphatically" turn down the job of Prime Minister if it was offered to him.
So what challenges await the man tipped by many to one challenge for the leadership of the Tory party?
With defeat at the polls Ken Livingstone, a colourful political figure for over 40 years, has stepped down.