overvote

A case in which a voter has marked a ballot for more choices than allowed by the rules

An overvote that took the form of punching Gore's chad and then writing his name (or Lieberman's) in the place for a write-in candidate would unambiguously manifest the voter's intention to vote for Gore.

A case in which more votes are cast in a voter's name than allowed under the rules

Overvotes are a relatively common phenomenon for shares held in a street name.

To spoil a ballot by marking it for more choices than allowed by the rules

[…] a poll worker can manually override the program and accept the ballot, even though it has been overvoted or undervoted.

To cast more votes than allowed under the rules

I know a great deal of difficulty ensues, and frequently brokers' shares are overvoted.

To outvote or overrule

Caleb and Joshua would have been overvoted by almost six hundred thousand Israelites; […]