Of course, there are several caveats to be slapped across all this – not least that Labour are bobbing up above the Tories in the polls. But it does seem that Ed Miliband's honeymoon period, such as it was, is crumbling fast. If his troops' unhappiness becomes, and remains, the story, then he will find it difficult to gain any sort of momentum over the next few months. Particularly as he is currently offering what is, at best, an uncertain policy prospectus.
The real worry for Labour is that this is 2007 all over again. Back then, Brown's unchallenged rise to the throne meant that Labour didn't have the internal debate it required; a debate which might have gone some way to resolving the old Brownite vs Blairite wars. This time, of course, Ed Miliband beat four other candidates to the job – but he did so thanks to union support, and with most Labour MPs backing his brother. For many of them, MiliE will continue to be part of the problem, not the solution. And that doesn't augur well for the stability of this, ahem, new generation.