This text investigates the evolving role and structural influence of political parties within the American democratic system. Author Marjorie R. Hershey, building upon the foundational work of Frank Sorauf and Paul Allen Beck, provides a comprehensive analysis of how parties function across three distinct spheres: the party organization, the party in the electorate, and the party in government. The book utilizes historical context and contemporary case studies to illustrate the mechanisms of political influence and the shifting landscape of campaign finance and partisan activism.

This work is widely regarded as a standard academic resource for undergraduate political science curricula due to its systematic approach to party dynamics. The text is noted for its consistent updating of data and its ability to bridge historical theory with modern political developments.