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.
若い有権者の投票率が課題になっている。
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.
法律文書では、ある権利を持つ人を有権者と呼ぶことがある。
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.
古い文章では、有権者が政治的な実力者を指すことがある。
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.