Do two parties represent the US? Clustering analysis of US public ideology survey

Abstract

Recent surveys have shown that an increasing portion of the US public believes the two major US parties adequately represent the US public opinion and think additional parties are needed [1]. However, there are high barriers for third parties in political elections. In this paper, we aim to address two questions: "How well do the two major US parties represent the public's ideology?" and "Does a more-than-two-party system better represent the ideology of the public?". To address these questions, we utilize the American National Election Studies Time series dataset [2]. We perform unsupervised clustering with Gaussian Mixture Model method on this dataset. When clustered into two clusters, we find a large centrist cluster and a small right-wing cluster. The Democratic Party's position (estimated using the mean position of the individuals self-identified with the parties) is similar to that of the centrist cluster, and the Republican Party's position is between the two clusters. We investigate if more than two parties represent the population better by comparing the Akaike Information Criteria for clustering results of the various number of clusters. We find that additional clusters give a better representation of the data, even after penalizing for the additional parameters. This suggests a multiparty system represents of the ideology of the public better.

Polis: Escalar de la deliberación mediante el mapeo de espacios de opinión de alta dimensión

“…Moreover, existing structures of representative democracy have proven inadequate in expressing the collective will of the people (Lee, Zhang & Yang, 2017), and have been shown to contribute to political polarization (Yang, Abrams, Kernell & Motter, 2020). Political parties themselves can be seen as a sort of clustering or reduced dimensionality across all possible issues of interest, frequently forcing voters to sacrifice their positions on issues of importance to them, and often not having any candidate at all representing their positions on other issues.…”