[tomjakubowski]

With Trump getting a little bit less than half the vote and a 65% turnout, "did not vote" was the plurality.

[JumpCrisscross]

Which is functionally a vote for the status quo. Someone who can't bother to vote isn't going to bother e.g. protesting or otherwise affirming their rights.

[datsci_est_2015]

Or defeatism. Discouragement campaigns go a long way: “both sides are bad so don’t vote!”

[hedora]

So, in this case, "plurality" means "third place".

[Braxton1980]

Not voting is a choice and the same as voting for the winner