In the sociology of social movements, many a printer cartridge has run dry discussing the problems of what we call 'frame alignment'. That is the problem by which a movement or, as is more usually the case, a social movement organisation of some kind has to gain wide currency for its world view. What this table from YouGov for the New Statesman shows is just how big that gap between Jeremy's support and the wider Labour-minded electorate is. This is a huge challenge for the party.
Of course, Labour as a whole isn't an ideological sect organised around some principles formulated by an all-knowing guru. It is the party of the labour movement and, as such, contains a very broad range of views in it. That's why the party spans the range from John McDonnell to Simon Danczuk. That's why when Labour faces the electorate in the Scottish, London, and local elections next year its programme for each will be significantly short of the full communism that gets Fleet Street in such a tiz.
So a dilution there will be. The electorate will never face Jeremy Corbyn naked, as it were. Perceptions nevertheless count. The electorate might like the sound of policies like rail nationalisation and lifelong access to education, but these are not issues that will swing the election. It's the economy or, to be more precise, the sense of self-security that's bound up with it. And Labour can win on this in one of two ways. Either popular confidence completely collapses in the Tories, or that Labour are perceived to have a better plan for Britain's economic security. Things might look a bit dicey in China at the moment, but we shouldn't hold out for another meltdown just in case it doesn't happen. The path to victory is via the latter route.
Identifying the problem is the easy bit. Coming up with a solution is not.