• Sam Rosenfeld

    Associate Professor of Political Science

    Colgate University

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    Welcome! I am an Associate Professor of Political Science at Colgate University, specializing in party politics and American political development. My research interests include the history of political parties, the intersection of social movements and formal politics, and the politics of social and economic policymaking. My first book, The Polarizers: Postwar Architects of Our Partisan Era (University of Chicago Press, 2018), offers an intellectual and institutional history of party polarization in the postwar United States. My second book, coauthored with Daniel Schlozman of Johns Hopkins University and titled The Hollow Parties: The Many Pasts and Disordered Present of American Party Politics (Princeton University Press, 2024), tracks party development in the United States since the Founding to account for our contemporary political discontents.


    My writing has also appeared in The American Prospect, Boston Review, Democracy, n+1, The New Republic, The New York Times, Politico, The Washington Post, and Vox.

  • The Hollow Parties

    The Many Pasts and Disordered Present of American Party Politics

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    America’s political parties are hollow shells of what they could be, locked in a polarized struggle for power and unrooted as civic organizations. The Hollow Parties takes readers from the rise of mass party politics in the Jacksonian era through the years of Barack Obama and Donald Trump. Today’s parties, at once overbearing and ineffectual, have emerged from the interplay of multiple party traditions that reach back to the Founding.

    Daniel Schlozman and Sam Rosenfeld paint unforgettable portraits of figures such as Martin Van Buren, whose pioneering Democrats invented the machinery of the mass political party, and Abraham Lincoln and other heroic Republicans of that party’s first generation who stood up to the Slave Power. And they show how today’s fractious party politics arose from the ashes of the New Deal order in the 1970s. Activists in the wake of the 1968 Democratic National Convention transformed presidential nominations but failed to lay the foundations for robust, movement-driven parties. Instead, modern American conservatism hollowed out the party system, deeming it a mere instrument for power.

    Party hollowness lies at the heart of our democratic discontents. With historical sweep and political acuity, The Hollow Parties offers powerful answers to pressing questions about how the nation’s parties became so dysfunctional—and how they might yet realize their promise.

  • Review quotes for The Hollow Parties

    David A. Bateman, author of Disenfranchising Democracy: Constructing the Electorate in the United States, the United Kingdom, and France

    “Schlozman and Rosenfeld provide an ambitious and novel account of the country’s contemporary political crises: the authoritarian threat from the Republican right, the listlessness of the Democrats, and the widening gulf between them. Provocative and insightful, The Hollow Parties makes a powerful argument that the defense of American democracy requires parties to again become central institutional actors in civic life.”


    E. J. Dionne Jr., author of Code Red: How Progressives and Moderates Can Unite to Save Our Country

    “This is a wonderful and necessary book rooted in a sense of urgency and a wise understanding of American history. The Hollow Parties argues persuasively and passionately that political parties are essential to a healthy democracy, and that their salvation lies not in raising gobs of money but in rooting themselves in the daily civic lives and bread-and-butter concerns of local communities. It’s also a joy to read a pathbreaking work of political science written in eloquent and elegant prose.”


    Lily Geismer, author of Left Behind: The Democrats’ Failed Attempt to Solve Inequality

    “This masterful book marks a landmark and paradigm-shifting study of American political parties. It is ambitious in the best sense of the word and is an argument with which anyone interested in American politics will have to contend.”


    Michael Kazin, author of What It Took to Win: A History of the Democratic Party

    “The most sweeping and most incisive history of party organization I have ever read. Schlozman and Rosenfeld have crafted a narrative that captures the drama and nuances of political behavior with the kind of zestful eloquence found in the work of the best historians. Nearly every page includes observations that made me reflect anew about matters I have been writing and teaching about for a long time. This is a truly impressive book.”


    Daniel Ziblatt, coauthor of Tyranny of the Minority: Why American Democracy Reached the Breaking Point

    "A sweeping, original, and deeply persuasive account of a hidden hinge of American democracy: political parties. To understand why and how our politics ended up where they are today, read this book."


    Library Journal

    "What sets this book apart from others about American political parties is its sense of urgency ... Schlozman and Rosenfeld argue forcefully for a resurgence of robust parties to get U.S. politics back on track."


    Ben Jacobs, Washington Examiner

    "In a moment when the misconception that there are two overly powerful political parties is too broadly held, [The Hollow Parties] provides a convincing and detailed counterargument that stronger parties would lead to a stronger political system."


    John Sides, Democracy

    "In this insightful book, the political scientists Daniel Schlozman and Sam Rosenfeld do three things. They tell the history of the six political traditions that have informed American political parties—what they call 'party strands.' They describe how political parties became 'hollow,' seemingly everywhere but lacking in fundamental capacities. And they provide a guide for revitalized parties. They are, unabashedly, 'partisans of parties.' This makes them a rare voice in our political conversation. Theirs is a voice well worth listening to."

  • The Polarizers

    Postwar Architects of Our Partisan Era

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    Even in this most partisan and dysfunctional of eras, we can all agree on one thing: Washington is broken. Politicians take increasingly inflexible and extreme positions, leading to gridlock, partisan warfare, and the sense that our seats of government are nothing but cesspools of rancor, childishness, and paralysis. The shocking reality, though, is that modern polarization was a deliberate project carried out by Democratic and Republican activists.


    In The Polarizers, Sam Rosenfeld details why bipartisanship was seen as a problem in the postwar period and how polarization was cast as the solution. Republicans and Democrats feared that they were becoming too similar, and that a mushy consensus imperiled their agendas and even American democracy itself. Thus began a deliberate move to match ideology with party label—with the vexed results we now endure. Rosenfeld reveals the specific politicians, intellectuals, and operatives who worked together to heighten partisan discord, showing that our system today is a product not solely of gradual structural shifts but of deliberate actions motivated by explicit agendas. Rosenfeld makes clear that the story of Washington’s transformation is driven both by institutional change and by grassroots influences on the left and the right.


    The Polarizers brilliantly challenges and overturns our conventional narrative about partisanship, but perhaps most importantly, it points us toward a new consensus: if we deliberately created today’s dysfunctional environment, we can deliberately change it.

  • Review quotes for The Polarizers

    Matthew Yglesias, cofounder and senior correspondent, Vox

    “Partisan and ideological polarization are defining features of our time, but they are more often denounced than understood. In The Polarizers, Rosenfeld sheds much-needed light on the origins of present-day politics—revealing the human actors who took deliberate steps to bring about the political alignment we know today. His readable, deeply informed narrative should change the way we think about the recent past and even our own times, showing the era of polarization to be not a fall from grace but a plausible response to the very real problems and dilemmas of the old political order. Rosenfeld’s new research and new insights brilliantly challenge much over-crusted conventional wisdom about polarization, and offers hints as to how conscious political action can help redress the flaws of the current party system much as past actors took steps to cure the ills of the past.”


    Andrew Hartman, author of A War for the Soul of America: A History of the Culture Wars

    “Using impressive, indeed herculean, amounts of archival work, Rosenfeld shows that as more and more Americans became politically aware and as, in the wake of the polarizing 1960s, people found ideological cohesion around economic and cultural issues, a growing number of ideologically driven and issue-based activists worked to ensure that the Democratic and Republican Parties respectively represented their cohering interests. Rosenfeld’s analysis is built upon a surprising irony: the very partisanship that so many pundits now lament was something that pundits of an earlier era wanted! The Polarizers is a provocative book that unlocks the black box of partisan polarization.”


    Julian E. Zelizer, author of The Fierce Urgency of Now: Lyndon Johnson, Congress, and the Battle for the Great Society

    “Many observers complain about partisanship in contemporary politics, but Rosenfeld provides a careful and fascinating history of the people who created our current system. Frustrated with the way that bipartisanship had created gridlock in the 1950 and 1960s, partisan entrepreneurs such as Paul Butler believed that strong and ideologically cohesive parties would offer a better way to govern. They believed that partisanship promised to make a stronger democracy. Through tremendous archival research, Rosenfeld shows how this all happened and provides a fresh perspective on the roots of our current system.”


    Ira Katznelson, author of Fear Itself: The New Deal and the Origins of Our Time

    “Less an elegy than an illuminating genealogy, The Polarizers places today’s sharp partisanship in historical context. Moving fluidly between fascinating particulars and systematic analysis, the book’s rich account of persons, motivations, and mechanisms illuminates central transformations within American political life, all the while offering acute judgments about the party system, past and present.”


    Steven Webster, Political Science Quarterly

    "A comprehensive analysis that is meticulously researched and presented in compelling fashion ... Rosenfeld's ability to highlight the intricate details of individuals' conscious decisions to push the American party system toward polarized ends while not neglecting to situate these decisions within a broader context is perhaps the most impressive aspect of the book. For those interested in the history of American political development and how our party system came to be so rancorous, The Polarizers is a must-read."


    Boris Heersink, Journal of Politics

    “A remarkable achievement in terms of its historical description ... As a political history of the post–World War II era, The Polarizers provides a comprehensive analysis of both parties’ development. The fact that Rosenfeld manages to cover both parties in this regard is impressive.”


    B. Dan Wood and Soren Jordan, Perspectives on Politics

    "Academics, especially political scientists, have provided a wide range of empirical evidence of increased polarization (particularly among elites) in American politics ... but what has been missing from recent political science work has been a focus on micro-level mechanisms operating in the modern era. ... Sam Rosenfeld fills this gap by providing a detailed account of these micro-level processes. Using a vast array of archival sources, he documents how polarization is largely the result of the initiative of a few key individuals wishing to instill national ideological unity in the parties in the face of competing pressures for local constituencies."


    Andrew J. Taylor, Party Politics

    "[C]areful and meticulously chronicled ... Here is an important work of recent American political history, enhanced by Rosenfeld’s skillful wordsmithing and silvery prose."


    James E. Cronin, Commonwealth & Comparative Politics

    "[E]xtremely useful ... A distinctive feature of Rosenfeld’s telling of the coming of polarization is that

    he pays roughly equal attention to what was happening on the right and the left."


    Mark Wickham-Jones, Journal of Contemporary History

    "Rosenfeld marshals an imposing volume of data and provides a historical underpinning that many other accounts lack ... Rosenfeld’s compelling text offers a gripping account of a fascinating period of party change throughout the United States."


    Matthew Avery Sutton, Journal of American History

    "This book should change the way we teach post-World War II American politics, the rise of a polarized electorate, and the evolution of the party system."


    Laura Jane Gifford, American Historical Review

    "Specialists will appreciate [Rosenfeld's] challenge to preexisting assumptions; a more general audience will also benefit from this insightful exploration of why our political system functions—or fails to function—as it does today."


    Mark Wickham-Jones, Journal of American Studies

    "[Rosenfeld] outlines a micro-level actor-focussed account of the mechanisms by which polarization emerged in the decades after 1945 ... Scholars pushed for polarization, justified it normatively, outlined potential reforms, battered politicians into accepting them, and legitimated many of the measures that policymakers subsequently introduced."


    Kirkus Reviews

    "A delight for policy wonks and politicos, Rosenfeld's insightful study of the development of political parties since World War II is highly instructive for our current moment."



    “A timely and significant contribution to the literature on political sorting and polarization that defines the current state of the two major American political parties ... A readable and well-structured history of our current party system ... Highly recommended.”


    Rose Deller, LSE Review of Books

    “A thorough and detailed study that introduces readers to the myriad figures who contributed to the development of what Rosenfeld deems the ‘polarization without responsibility’ of our present times.”


    Norman Ornstein, Democracy

    "As Sam Rosenfeld documents in his important new book, the polarization that resulted did not just happen, was not simply caused by people moving from one part of the country to another—it was presaged decades earlier, and pushed by a bevy of influential people ... Rosenfeld gets it just right, through prodigious research in the archives, including sifting through countless volumes of historical papers of the participants, and writes about it clearly and compellingly."


    Lee Drutman, Washington Monthly

    "For anyone who cares about our political future enough to learn from its past, The Polarizers is absolutely essential reading."


    Sam Tanenhaus, The New Republic

    "As Sam Rosenfeld shows in The Polarizers, the irrational-seeming “extreme partisanship” and “tribalism” that contaminate our politics today originated in the principled efforts of writers, activists, and politicians who thought the two parties needed more polarization, ideological fixity, and internal discipline."


    James Bowman, Weekly Standard

    “To some political junkies, reading Sam Rosenfeld’s book will be an exercise in almost unbearable nostalgia for that world of political stability and comity and the kind of genuine debate that can only come with mutual respect between those of differing political points of view ... [The Polarizers] is a tribute to the meticulousness of his scholarship in reconstructing such a difficult and complicated history, one that was complicated, at least in part, deliberately.”


    Fred Siegel, City Journal

    "'When partisan team spirit becomes reinforced by shared substantive beliefs on core issues,' notes Sam Rosenfeld, 'peoples’ partisan identities become a more intensely felt component of their self-identities. Righteous passion for one’s own side intensifies while distrust of and hostility toward the other side deepen.' He’s right ..."


    David Frisk, Law and Liberty

    "The main strength of The Polarizers is its richly detailed account of how the institutional Democratic Party changed—of how, indeed, it changed to the point that Bernie Sanders came close to winning its nomination in 2016 ... Still, his accurate account of the GOP’s evolution is noteworthy in at least two ways. He points out various calls by significant figures for a more right-wing party as early as the late 1940s, and he shows the extent of national chairman Bill Brock’s cooperation in this transformation in the late 1970s—especially in the establishment of supply-side tax cuts as a common GOP message."

  • Publications and Media




    The Hollow Parties: The Many Pasts and Disordered Present of American Party Politics (Princeton University Press, 2024). With Daniel Schlozman.


    The Polarizers: Postwar Architects of Our Partisan Era (University of Chicago Press, 2018).


    Articles and chapters:


    “A Mix of Motives: The Georgia Delegation Challenge to the 1968 Democratic Convention and the Dynamics of Intraparty Conflict.” American Review of Politics 37.2 (2020): 48-70. With Nancy Schwartz.


    “The Hollow Parties.” In Can America Govern Itself?, edited by Frances Lee and Nolan McCarty (New York: Cambridge University Press, 2019), 120-151. With Daniel Schlozman.


    “Party Blobs and Partisan Visions: Making Sense of Our Hollow Parties.” In The State of the Parties: The Changing Role of Contemporary American Parties 8th ed., edited by John C. Green, Daniel J. Coffey, and David B. Cohen (Lanham, MD: Rowman & Littlefield, 2018), 32-48. With Daniel Schlozman.


    "Prophets of Party in American Political History." The Forum 15.4 (2018): 684-709. With Daniel Schlozman.


    Fed by Reform: Congressional Politics, Partisan Change, and the Food Stamp Program, 1961-1981.” Journal of Policy History 22.4 (2010): 474-507.

    Works in progress

    "The Multiple Traditions in American Party Politics." Working Paper with Daniel Schlozman.

    Book reviews

    "Democracy is in Peril, Just Not the Way We Thought," review of Tyranny of the Minority: Why American Democracy Reached the Breaking Point by Steven Levitsky and Daniel Ziblatt, The New Republic, December 2023.


    "Big Tent Blues," review of What it Took to Win: A History of the Democratic Party by Michael Kazin, The New Republic, March 2022.


    Review of Verlan Lewis, Ideas of Power: The Politics of American Party Ideology Development. Presidential Studies Quarterly 52.1 (March 2022): 250-251.


    "It Takes Three (or More)," review of Breaking the Two-Party Doom Loop by Lee Drutman, Boston Review, April 14, 2020.


    Review of Mark Wickham-Jones, Whatever Happened to Party Government? Controversies in American Political Science. American Review of Politics 37.1 (2020): 140-142.


    Review of Josh Pacewicz, Partisans and Partners: The Politics of the Post-Keynesian Society. American Journal of Sociology 125.3 (Nov. 2019): 886-888.


    Review of Lilliana Mason, Uncivil Agreement: How Politics Became Our Identity. Political Science Quarterly 134 (2019): 341-343.


    Critical dialogue with B. Dan Wood and Soren Jordan, Party Polarization in America: The War Over Two Social Contracts. Perspectives on Politics 16 (2018): 796-798.


    Review of Timothy J. Minchin, Labor Under Fire: A History of the AFL-CIO Since 1979. Labour/Le Travail 81 (2018): 293-296.


    "There's No Going Back," review of The Great Exception by Jefferson Cowie, Democracy: A Journal of Ideas (Spring 2016).


    "Should Liberals Back Public Employee Unions?," review of Government Against Itself by Daniel DiSalvo and Bring Back the Bureaucrats by John J. DiIulio, Jr. The American Prospect (Summer 2015). With Jake Rosenfeld.


    Smooth Operator,” review of The Whole Damn Deal by Kathryn McGarr. The American Prospect (September 2011).


    A Long-Distance Runner,” review of Citizen Rauh by Michael E. Parrish. The American Prospect (December 2010).


    Frustrated by His Own Party,” review of Roosevelt's Purge by Susan Dunn. The American Prospect (November 2010).


    The Truth About the Senate,” review of The Most Exclusive Club by Lewis Gould. The American Prospect (December 2005).

    Selected other publications

    "How Conservatives Changed the Whole Point of American Political Parties." Made By History, Time, June 10, 2024. With Daniel Schlozman.


    "Why political parties desperately need to make a comeback." Interview with David Weigel. Semafor, May 10, 2024. With Daniel Schlozman.


    "Democrats are Feckless and Republicans are Chaotic. Here's Why." Interview with Ian Ward. Politico, May 1, 2024. With Daniel Schlozman.


    "The Republican Party Has Devolved into a Racket." New York Times, September 18, 2023. With Daniel Schlozman.


    "Did the Democrats F*** It Up?" n+1, May 19, 2022. With Daniel Schlozman.


    "Democracy is on the brink of disaster. For voters, it's politics as usual," Washington Post, January 9, 2022.


    "Prospect Perspectives on the 9/11 Attacks," The American Prospect, September 10, 2021. With Matt Duss, Harold Meyerson, and Sasha Polakow-Suransky.


    “The Revival of the Nevada Democratic Party.” SNF Agora Case Study, August 6, 2021. With Daniel Schlozman.


    "What happened to that 'blue wave'?" Washington Post Monkey Cage, November 10, 2020. With Daniel Galvin and Daniel Schlozman.


    "Joe Biden's nostalgia for 'civility' is nostalgia for the politics of Jim Crow." Washington Post Monkey Cage, June 21, 2019.


    "The dilemmas for Democrats in 3 past visions for the party." Vox Polyarchy, June 13, 2019. With Daniel Schlozman.


    "People used to joke about 'Democrats in disarray.' They're not joking now." Interview with Henry Farrell. Washington Post Monkey Cage, January 30, 2019.


    "Why Steve King's Punishment Took So Long." New York Times, January 15, 2019. With Daniel Schlozman.


    "What History Teaches about Partisanship and Polarization." Scholars Strategy Network, July 23, 2018.


    "The Democratic Party is moving steadily leftward. So why does the left still distrust it?" Vox, June 22, 2018.


    "How the American Two-Party System Became So Divided." Interview with David Frum. The Atlantic, April 8, 2018.


    "How Feminists Became Democrats," Politico, February 3, 2018.


    "Can Steve Bannon Realign American Politics?" New York Times, December 8, 2017.


    "Two Cheers for Polarization." Boston Review, October 25, 2017.


    Media appearances

    The Weekly Show with Jon Stewart podcast, June 27, 2024.


    Lost in the Middle podcast, June 25, 2024.


    The Ezra Klein Show podcast, June 4, 2024.


    New Books Network podcast, May 20, 2024.


    The Briefing with Steve Scully, SiriusXM, May 17, 2024.


    The New Liberal Podcast, May 14, 2024.


    The Michael Shermer Show, June 14, 2022.


    13 podcast, February 24, 2022.


    Spectrum One, April 26, 2021.


    WAER, February 10, 2021.


    PBS NewsHour, February 4, 2021.


    RadioWest, KUER, January 7, 2019.


    Fogged Clarity podcast, October 12, 2018.


    PBS Digital Studios' "America From Scratch," August 25, 2018.


    The Ezra Klein Show podcast, June 30, 2018.


    Slate's The Gist podcast, May 22, 2018.


    The Majority Report podcast with Sam Seder, February 21, 2018.


    Thinking Aloud with Marcus Smith, BYURadio, February 9, 2018.


    New Books Network podcast, February 5, 2018.


  • Teaching


    Political Polarization and American Democracy - Syllabus

    America as a Democracy - Syllabus

    American Political Development - Syllabus

    War and the Shaping of American Politics - Syllabus

    American Elections and Party Power - Syllabus

    The Presidency and Executive Leadership - Syllabus

  • Contact

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    Sam Rosenfeld

    Associate Professor, Department of Political Science

    Colgate University

    13 Oak Drive

    Hamilton, NY 13346




    cell: 202-487-9103

    work: 315-228-6464