From Politics in America (1983), describing then NY-20
Westchester's politics are determined at least as much by liberal Jewish suburbanites and more conservative middle class Italian neighborhoods as by Wasp enclaves. Republicans have a small registration advantage in the redrawn 20th district, enhanced by the addition of GOP towns such as Eastchester and Mount Vernon...Jewish voters diluted the Republican sentiment in wealthy Scarsdale...Republicans have their bastions in Larchmont, Pelham and New Castle. Map makers further bolstered GOP strength by adding several similar suburban enclaves such as Bronxville and Briarcliff Manor.
Interesting that Mount Vernon was Republican leaning at the time. It must have been far whiter then because today it's majority non-white and very Democratic.
