Historian Lily Geismer traces the Democratic Party's transformation from its New Deal coalition of working-class voters and organized labor to its contemporary base among educated professionals, examining how this shift occurred through changes in metropolitan Boston's Route 128 technology corridor. Following residents of suburbs like Lincoln, Lexington, and Concord from the 1960s through the 1990s, she shows how liberal professionals reconciled support for civil rights with opposition to housing integration in their own communities. These voters developed a politics that emphasized education, meritocracy, and market-based solutions while resisting policies that would challenge their own advantages. Geismer shows how the anti-war movement, the new politics of the McGovern era, and eventually Clintonism drew on this base, replacing New Deal emphasis on structural reform with technocratic solutions that maintained professional class privilege. Her analysis helps explain why the Democratic Party has lost working-class support even as it has gained among educated suburbanites. Geismer, a professor of history at Claremont McKenna College, combines archival research with demographic analysis to trace this realignment at ground level. For anyone seeking to understand contemporary American politics, this work provides essential context for the class dynamics that shape both parties.