As far as I can gather, Jim Murphy's latest wizard attack-line goes something like this : Nicola Sturgeon has broken her promise that the independence referendum was a once in a lifetime event. An SNP landslide will set Scotland on an unstoppable course for a second referendum. Vote Labour so Ed Miliband can act like a despot and block a referendum even if the majority of Scots vote for one.
There are, however, just three small problems with this -
1) It's based on a cynical, deliberate, downright lie. Nobody in the SNP - not Nicola Sturgeon, not Alex Salmond, NOBODY - ever promised that the referendum was a once in a lifetime event. Nor did anyone in the SNP even promise that it was a once in a generation event. What did happen was that Alex Salmond stated that in his opinion constitutional referenda should be once-per-generation (defined as roughly 15 years), but he ALWAYS stressed that was only a "personal view", and not one that could bind the SNP or the people of Scotland. The only reference to "a lifetime" was the observation that it might be a once in a lifetime opportunity, which was a statement of the bleedin' obvious - ie. there was no guarantee that people would vote for a referendum again. How exactly that was supposed to constitute a "promise" is anyone's guess.
2) It's a direct contradiction. If a win for the SNP is supposed to make a referendum unstoppable, how can Miliband credibly promise to stop it regardless of whether the SNP win? (Not to mention the fact that, as we discussed last night, there isn't universal acceptance of the view that he even has the despotic legal powers he thinks he does to thwart the democratic will for a consultative referendum.)
3) If Labour are using an absurd distortion of what Alex Salmond said about timescales to claim that last year's No vote was a vote to prevent a future referendum, it's going to be remarkably easy for us to take what Labour are ACTUALLY saying right now, and make the following case after next Thursday : "Labour promised that a vote for the SNP in the 2015 election was a vote for a second referendum. Well, people voted SNP. Labour cannot now break that promise and try to block a referendum from taking place at a time of the electorate's own choosing."