In which case, I was tempted to just copy-and-paste a post I wrote last year, on a similar subject, and at almost exactly the same time in the political cycle. Its point was that stories about tension between Brown and Darling could work to undermine Labour's overall economic message. As it happens, that's still the case. And, like then, I still think that the measures in the PBR will hardly match up to the scale of the debt mountain.
But it's worth emphasising one difference between then and now (and between now and the last Budget in April, even). In the intervening period, Brown has – in a mumbling, reluctant kind of way – admitted the need for cuts. And that, by itself, is enough to add a little bit of narrative uncertainty into the mix. It's even got one or two Tories I've spoken to fearful that this PBR could help Labour claw back some lost ground on fiscal sanity.