In recent elections, ‘progressives’ in centre-left parties have advocated for more democratised processes of candidate selection. We test whether more inclusive and decentralised selectorates align with higher numbers of progressive candidates nominated in national legislative elections by centre-left parties across three advanced western democracies between 2017 and 2021. In the Labour Party, more centralised selectorates aligned with higher numbers of progressives selected. For the SPD, we report null findings, likely due to additional incentives for factional co-operation in a multi-party system. In our most decentralised case, the Democratic Party, selection of progressives was congruent with district partisanship rather than selectorate inclusivity, with progressives more commonly selected in safe rather than competitive or unfavoured districts. This relationship was not present in our other cases. These findings highlight the importance of the decentralisation dimension for the factional allegiance of legislative candidates nominated.
