If you start hearing this word a lot a month from now, remember you heard it here first

I'm not saying this is likely; I'm just saying that it might be a concept to have on your radar, particularly in places like New Hampshire.

Undervote (from Wikipedia)

An undervote occurs when the number of choices selected by a voter in a contest is less than the minimum number allowed for that contest or when no selection is made for a single choice contest.

In a contested election, an undervote can be construed as active voter disaffection - a voter engaged enough to cast a vote without the willingness to give the vote to any candidate.