The government actions of populist radical right (PRR) parties have predominantly been scrutinized at the national level, leaving a critical aspect – their territorial foothold – largely unexplored. Through a comparative ethnographic study of two medium-sized French towns governed by the Rassemblement National since 2014, this article delves into how seizing municipal power has influenced the party's efforts towards mainstreaming. We examine the party's strategy, aimed at institutionalization, which relies on a blend of rhetoric emphasizing proximity, pragmatism, and non-partisan administration while preserving fundamental ideological elements of the radical right. This amalgamation of mainstreaming and radicalism, adaptive to different contexts and audiences, is termed ‘adaptable ideology’. Our study makes significant contributions to two pivotal aspects of the literature: understanding the mainstreaming trajectory of PRR parties and exploring the recent, localist turn in the study of this political realm.
