College roommates have a modest but significant influence on each other's political ideology
In: Proceedings of the National Academy of Sciences of the United States of America
Significance Understanding the relationship between college and political ideology is of increasing importance in the United States in the context of intense partisan polarization. Leveraging a quasi-experiment and a panel survey, we find no evidence that a sample of students moves leftward along the political spectrum during the first year of college. However, we find strong evidence of a causal effect of roommates: Students move toward their randomly assigned roommates' political ideology over the course of their first year of college. Our study identifies causal evidence of social network effects for political views and identifies these causal effects for college students specifically. Our findings are inconsistent with claims that college makes students more liberal.