swing voter

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Noun1.swing voter - a voter who has no allegiance to any political party and whose unpredictable decisions can swing the outcome of an election one way or the other
elector, voter - a citizen who has a legal right to vote
References in periodicals archive ?
But the blend of politics and piety could alienate swing voters thought to decide general US elections.
Fewer "Safe Seats": Currently, elections are decided by 500,000 swing voters in the 150 marginal seats likely to change hands at general elections.
That is a lower proportion of swing voters than Gallup measured in the prior two midterm elections.