N-COUNT (对选举结果起决定性作用的)独立选票,关键选票 In a situation when people are about to vote, the swing vote is used to talk about the vote of a person or group which is difficult to predict and which will be important in deciding the result. (对选举结果起决定性作用的)独立选票,关键选票 [mainly US, journalism]
...a Democrat who holds the swing vote on the committee.