My dissertation explores the importance of geographic mobility in the politics of globalization. I find that voters' ability to easily relocate across labor markets determines how they form political attitudes about trade. Low mobility voters chiefly consider how globalization affects their local labor market while high mobility voters, who are less rooted in a given community, rely on their sector of employment and other individual indicators. These effects of geographic mobility in preference formation are consistent with an economic geography perspective of trade politics. I explore the implications for voting, partisanship, and policy over the short and long run.