Smithson is a Cameron-friendly Liberal Democrat who has done a great deal to establish the blog as a significant political forum. But he was off the mark in suggesting that a game-changing intervention had given David Miliband "the big Mo" and may even now have made his campaign "unstoppable".
The big news tonight in the Labour race is a statement by Douglas Alexander, who was previously a strong Mili-Ed supporter, on why he has come out backing Mili-D.
This follows the endorsement from Alistair Darling and it looks as though Alexander, a key figure, has worked out where this race is going and wants to be on the DM band-wagon.
That account will surprise both Milibands - since Douglas Alexander has been co-chairing the David Miliband campaign from the start, and was writing for the Labour Uncut blog in that capacity, to make a strong pitch for his candidate's credentials.
The error was picked up by several contributors, though it has yet to be corrected. Smithson has openly declared his gamble on a David Miliband victory at 7-1 last Autumn, and the website has a strong policy and consistent record of contributors being transparent about when they have a stake in any outcome.
Securing Alexander for Team Miliband (D) was an important enough coup to be the opening contender in my most surprising nominations stakes.