Rest in peace, Christopher. Your agile mind, your books, and your intolerance of idiocy will always stay in our memory.

The thing is that the author of such analysis makes the claim that the % of votes for a particular party does not depend on voter turnout. He thinks that percentage does not change, regardless of whether you have 10% turnout or 100% turnout. That's the lynchpin of his argument. I am not sure one can make that claim. You would have to be a sociologist, not a mathematician.