This document discusses the origins and formation of political opinions in Americans. It explains that political socialization is the process by which people acquire their political beliefs and values from primary influences like family and schools during childhood. It also discusses secondary influences like peers, media, and events that can shape political views over time. Additionally, it examines common frames of reference like party identification, ideology, and group orientations that Americans use to evaluate political issues. Finally, it reviews methods of measuring public opinion through polls and the relationship between public opinion and policymaking.