eligible voter; elector; constituent; the electorate
The ordinary modern political sense: a person who has the right to vote, or voters as a group. It does not necessarily mean someone actually cast a ballot.
The candidate appealed to voters for support.
The turnout among young voters has become an issue.
holder of a right; rightsholder
Legal or technical use for a person who possesses a particular right. In everyday contexts 権利者 is often the more expected word.
In legal documents, a person who holds a certain right may be called a rightsholder.
person with political clout; bigwig
Rare use referring to someone who has power or influence, especially political influence. Modern Japanese more commonly uses 有力者 for this idea.
In older writing, 有権者 can refer to a politically influential person.
The candidate appealed to young voters.
The policy gained the support of many voters.
Once you turn eighteen, you need to register as a voter.