Steve Ansolabehere, professor of government at Harvard, describes his research on U.S. elections, public opinion, and energy politics. He explains the development of large-scale survey research, including the Cooperative Election Study, which is widely used by academics, journalists, and political practitioners. The conversation outlines how survey data is used to study voting behavior, policy preferences, and divisions in the United States. Ansolabehere also identifies four major demographic groups that align strongly with political parties, alongside a broader “mosaic middle.”