The electorate self-selected into voters and non-voters, it wasn't a random sample. Some chose to go to the polls and some chose to stay at home. Voter preferences don't say a lot about the preferences of non-voters, who've already shown they choose differently.
It shouldn't be that hard for you to show some evidence things would be different then. There is nothing indicating a stronger preference to vote has anything at all to do with which direction you lean. More and less does not equal right and left, so the burden of proof is on those who claim it is relevant. Yet polling indicates things would have gone pretty much just as they went.
I don't know if voters and non-voters have the same political leanings. It isn't something I've ever looked into. My observation was merely that measures of statical confidence assume random samples. Extrapolating from a non-random sample can give odd results. But this isn't a research paper, so it doesn't much matter.
