People didn't expect the Titanic to sink, either.
[afew's Crystal Ball of Doom™ Technology]
This isn't just the end of Blair's hopes, it's the end of Blair's influence. Once Dubya was gone, he lost his most significant patron.
He has no one of equal seriousness to lean on now. What's left of the rabid right will be happy to throw him to the dogs.
I predict another book deal, soon.
