Party influence in presidential primaries: Evidence from Mexico

Over recent decades, an increasing number of presidential candidates across the world have been nominated in primary elections. Yet, our understanding of presidential primaries outside of the U.S. remains very limited. This paper advances a theoretical argument linking presidential primary outcomes to the strategic behavior of subnational party elites, particularly those with the resources to mobilize primary voters in their regions. I provide support for this claim using an original dataset from the 2012 presidential primary of the Mexican Partido Acción Nacional (PAN), in which one of the candidates was very closely linked to (and informally endorsed by) the PAN leadership. The results show the levels of support for this candidate were higher in places with PAN officeholders. Additional evidence suggests this pattern is driven by PAN officeholders (1) investing resources into electoral mobilization and (2) tampering with the lists of registered voters.