Answer: WRITEIN

AnswerCrossword Clue
WRITEINSort of vote
WRITEINOptional ballot space
WRITEINUnlisted candidate
WRITEINType of vote.
WRITEINKind of candidate who's rarely successful
WRITEINRare electee
WRITEINThird-party vote, at times