The impact of endorsements in intra-party elections: Evidence from open primaries in a new Portuguese party

What affects the prospects of candidates in open intra-party elections? This research article examines the determinants of candidate performance in the first open party primaries conducted by LIVRE, a newly emerged Portuguese party, in 2015. This innovative process of candidate selection allowed individuals from outside the party not only to vote but also to run for office. Through the construction of an original dataset and the use of social network analysis, this study shows that centrality in the network of endorsements has a significant impact on the probability to be selected in party lists. Our findings shed additional light on the determinants of success in candidate selection and open new insights into the dynamics behind party primaries.