noun
swing vote; floating vote
Refers to voters not firmly committed to a particular party, whose support can shift between elections.
選挙のたびに浮動票の動向が注目される。
The movement of swing votes attracts attention at every election.
浮動票を取り込むために、各
To capture floating votes, each party is devising its campaign pledges.
Compound of 浮動 (ふどう, 'floating; drifting') and 票 (ひょう, 'vote; ballot'). The term is a modern political coinage.