swinger
n. countable C1 Advanced US //ˈswɪŋɝ// swinger Archaic Informal Slang
n. a person who changes their political opinion or support often. You use this to describe someone who does not stay loyal to one political party for very long.
n. a voter or supporter who frequently changes political allegiance or party preference. Often used in the context of electoral politics to describe individuals who do not identify with a single ideological bloc.
From swing + -er.
From swinge + -er.