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True, but if they didn't vote in the Brexit referendum are they going to vote in the general election.
Corbyn has said a number of times that one of his tactics is to get the non-voting public to vote for him but he's been fairly short on details as to how (and there aren't any suggestions that there are a huge number of untapped labour voters out there, the non-voters are meant to be fairly evenly split on party lines).
It may work, part of Trump's success was abandoning areas he wouldn't win and focusing on getting more voters out in his areas of support, but Labour haven't really harnessed the public interest to get people out and voting for them.
aggi-
I think the whole 'untapped Labour vote' idea comes from the fact that the age group least likely to vote Conservative (18-25) is also least likely to turn out.
But from my experience working with this age group, there's also a lot of don't cares/nihilists in this age range who probably wouldn't give a shit anyway.
For the Scottish referendum, turnout was higher among 16 and 17 year olds.
tbc
36% of population voted Brexit. That leaves 64% who either voted remain or didn't vote...