Overvote
From Ballotpedia
An overvote occurs when an elector casts more votes in a contest than is allowed. This results in a spoiled vote, a ballot which is not counted in the final tally. For example, a voter who votes for two candidates in a contest that permits only one vote has overvoted, and his or her ballot cannot be counted for the race in which the voter overvoted.[1][2]
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