Minor Party Major Change: Democratic Environmental Re‐Prioritization in Response to Green Party Competition
2025-05-13
How does the emergence of new political competition alter established party behavior? In this article, I analyze how major parties in the United States adjust their agendas in response to new third‐party competition. By analyzing state party platforms using text as data, I show that the emergence of Green Party competition prompts a re‐prioritization of environmental issues within the Democratic platform. Unlike previous literature in the United States focused on adaptation in issue positions or ideology, I demonstrate that adaptation occurs in the salience an issue is given. This happens when a third party strategically contests close elections; the ideologically similar major party will re‐focus on the new third party's policy priorities. This article highlights the role that third parties play in shaping the agendas of major parties, underscores the continued importance of party adaptation in maintaining the two‐party system in American politics, and illustrates the influence that electorally marginalized interests can exert on major parties.