swinging voter

noun

1. informal.
   a person who does not vote consistently for any single political party Also called (esp in Britain)floating voter

Example Sentences

"Personally I'm a swinging voter and at the moment I'd vote for anyone but the leading parties," one plain-speaking race-goer says.

From BBC

The Climate Institute poll reflects many other recent surveys that show the government risks being caught on the wrong side of swinging voter opinion ahead of elections expected next year.

From Wall Street Journal

Distinct from the more traditional swinging voter, authors Ron Booker and Eric Sidoti see these 18-24-year-old voters as permanently unaligned and developing "electoral habits of their own making".

From BBC