[dragonwriter]

> At least in the US, with low voter turnout (55% for the 2016 election is quoted by this page [1]) then someone has a somewhat large chance of simply randomly picking a non-voter as their "surrogate"

Sure, that gives one person doing it one time a fairly reasonable chance of not being detected.

It doesn't give a repeated, signficant pattern of such fraud a decent chance of avoiding detection.