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Related to swinging voter: Floating voters
(Government, Politics & Diplomacy) informal Austral and NZ a person who does not vote consistently for any single political party. Also called (esp in Britain): floating voter
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014