Neither main party is much of a good representation of their base. That's because they want to get elected. But the two big parties memberships have hollowed out over the years, such that the majority of their supporters and campaigners seem to be further from the centre than their MPs and leadership.
Which is why you find almost as much anti-Cameron vitriol in the Telegraph as you will in the Guardian or Mirror. And I'd guess why Cameron has consistently polled as more popular personally than the Conservative Party.
The Americans have a similar situation, where Donald Trump appears to be appealing to the Republican base at the primaries. But I suspect would get slaughtered at the national election. Although early leaders in the primaries do tend to get slaughtered before the end.
If Corbyn doesn't win at this point, it's going to leave painful scars, and either Burnham or Cooper will have their work cut out to heal the party.
But if he does win, I can't see Labour's parliamentary party holding together. They might be no formal split, but they will be totally unable to work together. There's blame on both sides for that, but a serial rebel like Corbyn has no right to claim anyone else's loyalty. And there have been some pretty hair-raising comments from some of his supporters about purging the opposition.
Even if he had the best policies in the world, if he can't command the loyalty of his own party, he can't win an election. Miliband was given a reasonably easy ride by the Parliamentary party. There was no more grumbling than any other leader has to face - and he did well at keeping the party united. Corbyn has no hope of that. If he wins it will be a horrible mess.