For Deux-Sèvres (and Maine-et-Loire in 1914), maybe textile industries around Cholet and in towns in the northern part of the department.
Yeah, there's always been industry in Cholet etc, but it's always been Catholic working class votes and I don't recall seeing any sustained long-term socialist tradition.
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The Choletais has always been very conservative since the beginning of the third Republic, but the Baugeois (the north-eastern part of the department) was left leaning at this period and stayed like this until the 60's at least.