Book excerpt: This book examines the hearings that followed Mormon apostle Reed Smoot’s 1903 election to the US Senate and the subsequent protests and petitioning efforts from mainstream Christian ministries disputing Smoot’s right to serve as a senator. Exploring how religious and political institutions adapted and shapeshifted in response to larger societal and ecclesiastical trends, The Reed Smoot Hearings offers a broader exploration of secularism during the Progressive Era and puts the Smoot hearings in context with the ongoing debate about the constitutional definition of marriage. The work adds new insights into the role religion and the secular played in the shaping of US political institutions and national policies. Chapters also look at the history of anti-polygamy laws, the persistence of post-1890 plural marriage, the continuation of anti-Mormon sentiment, the intimacies and challenges of religious privatization, the dynamic of federal power on religious reform, and the more intimate role individuals played in effecting these institutional and national developments. The Smoot hearings stand as an important case study that highlights the paradoxical history of religious liberty in America and the principles of exclusion and coercion that history is predicated on. Framed within a liberal Protestant sensibility, these principles of secular progress mapped out the relationship of religion and the nation-state for the new modern century. The Reed Smoot Hearings will be of significant interest to students and scholars of Mormon, western, American, and religious history. Publication supported, in part, by Gonzaba Medical Group. Contributors: Gary James Bergera, John Brumbaugh, Kenneth L. Cannon II, Byron W. Daynes, Kathryn M. Daynes, Kathryn Smoot Egan, D. Michael Quinn