The Great Recession, along with other socio-political processes, opened a new political space for populist challenger parties. The electoral success of a distinctive left-wing populism in Europe - parties who politicize the denationalization process in socio-economic terms and populist directions - raises new questions that are interesting for our understanding of the current transformations of European party systems. Although the profile of right-wing populist parties has been under investigation for years, the mere existence of left-wing populist parties (LPP) in Europe was “striking” until recently, letting their voters understudied. Recent studies show that LPP electoral support is motivated by a combination of political ideology and populist attitudes, being the socioeconomic issue positions the most important for LPP’s voters. Our study proposes a further examination of the impact of programmatic elements in line with the theories on the formation of libertarian and inclusive preferences on voting for LPP.  Beyond the exploration of the core socio-structural features of LPP’s voters, we offer here an empirical test that takes a broader consideration of ideological elements, adding to economic issues redistribution (greed in Kitschelt and Rehm 2015’s terms), inclusiveness (group) and horizontal and participatory politics (grid) attitudes to assess how they relate to electoral support for LPP. Our hypotheses are examined cross-nationally from two voter surveys conducted in France and Spain, two countries that can be considered as representative of the set of Southern European countries in which successful LPPs are present. Our data point out that LPPs’ voters support economic equality and common good, horizontal governance and participatory politics and are inclusive with immigrants.