Niche parties, which have been defined as focusing on a narrow range of issues their competitors neglect, are a phenomenon that has so far been described and analysed primarily in Western Europe. In this paper, we extend existing work by examining the presence and nature of niche parties in Latin America. Using the expert survey data collected by [Wiesehomeier, N., and K. Benoit. 2009. "President, Parties, and Policy Competition." The Journal of Politics 71: 1435-1447], we show that there are niche parties in most Latin American party systems. Two kinds of niche party, traditionalist and postmaterialist, predominate. We also show that niche parties, despite being defined based on issue-based characteristics, are in fact less programmatic in their linkage strategies than mainstream competitors. Instead, niche parties are slightly more likely to draw on charismatic strategies and tend to establish strong organizational links to ethnic and religious organizations. Niche parties in Latin America are primarily vehicles for the mobilization of group interests. These findings have implications for our understanding of political representation in new democracies and niche party strategies more generally. Recent research on party systems and party competition has focused extensively on niche parties, which are generally defined as parties that focus on certain issues their competitors tend to ignore, with all other parties then classed as "mainstream"

The micro-foundations of party unity are still an understudied topic in comparative politics. This article explores the effects of political ambition on party loyalty in Members of the Chamber of Deputies’ (MCDs) claimed votes based on attitudinal data. Ambition theory posits that ambitious politicians should act according to the (s)electorate they are aiming to win for the next election, therefore acting prospectively in their legislative votes. Findings suggest that MCDs seeking office in the national executive branch are more likely to follow the party line and less likely to side with their district or vote inconsistently. While inclusiveness of candidate selection procedures alone does not have an effect, its interaction with differing ambitions does. The results provide us with a first systematic analysis of ambition and its effect on party loyalty in 14 countries by examining the individual MCD more closely.

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