"Yes, we did" - but that's a slogan for a day. "Yes we can" is more than that - as Obama said in that speech last night "This victory alone is not the change we seek. It is only the chance for us to make that change."

And even if it did turn out that Obama was to be the same kind of disappointment that Tony Blair was - and I've got a feeling he won't - that shouldn't be the end of it, because there are millions of people out there with the strength to make "Yes we can" a reality.