It's still nowhere near enough. And where are these people? If they are in the South East, where the Tories already hold most of the seats anyway, then who cares?
Who reading this has ever been polled? I never have been, and nor has anyone else whom I have ever asked this question. Furthermore, most opinion polls are now conducted over the phone, so the pollsters know whom they are polling.
All in all, it seems clear that the aim of these things is not to measure public opinion, but to influence it. In this case, to make the unwary think that the super-posh, super-liberal Heir To Blair can win, and that most people want him to.
Not that Brown is an any more attractive prospect, but neither of these things is in fact the case.