Less than 1% of the electorate have membership of the main political parties. And many Labour MPs did not vote for Corbyn as leader.
It is impossible to know how many Labour voters who are not party members support his policies or would have voted for him in an election.
Politics was due for a shake up. There were no real personalities any more. This was the appeal of the likes of Farrage, at least he was 'different' but many balked at what he stood for.
Then along came Nicola Sturgeon, a breath of fresh air, straightforward and seemingly honest, and the SNP swept out Labour from Scotland in the election, while Labour voters in England saw their party defeated.
When the leadership election then offered up someone as different as Jeremy Corbyn, no wonder party members voted him in. He broke the mould and his outspoken difference was what they wanted instead of the usual suited, mealy mouthed, placating politicians who've gone be before.
Love him or hate him or bemused and still making yiur mind up, at least politics is more interesting these days.