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Activists and Conflict Extension in American Party Politics



Party activists have played a leading role in “conflict extension”—the polarization of the parties along multiple issue dimensions—in contemporary American politics. We argue that open nomination systems and the ambitious politicians competing within those systems encourage activists with extreme views on a variety of issue dimensions to become involved in party politics, thus motivating candidates to take noncentrist positions on a range of issues. Once that happens, continuing activists with strong partisan commitments bring their views into line with the new candidate agendas, thus extending the domain of interparty conflict. Using cross-sectional and panel surveys of national convention delegates, we find clear evidence for conflict extension among party activists, evidence tentatively suggesting a leading role for activists in partisan conflict extension more generally, and strong support for our argument about change among continuing activists. Issue conversion among activists has contributed substantially to conflict extension and party commitment has played a key role in motivating that conversion.


Corresponding author

Geoffrey C. Layman is Associate Professor, Department of Political Science, University of Notre Dame, 217 O'Shaughnessy Hall, Notre Dame, IN 46556 (
Thomas M. Carsey is Pearsall Distinguished Professor of Political Science, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599 (
John C. Green is Distinguished Professor of Political Science, University of Akron, 223B Olin Hall, Akron, OH 44325 (
Richard Herrera is Associate Professor, School of Politics and Global Studies, Arizona State University, Coor Hall, 6th Floor, Tempe, AZ 85287 (
Rosalyn Cooperman is Assistant Professor, Department of Political Science and International Affairs, University of Mary Washington, 1301 College Avenue, Fredericksburg, VA 22401 (


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Abramowitz, Alan I., McGlennon, John J., and Rapoport, Ronald B.. 1983. “The Party Isn't Over: Incentives for Activism in the 1980 Presidential Nominating Campaign.” Journal of Politics 45: 1006–15.
Abramowitz, Alan I., McGlennon, John, Rapoport, Ronald B., and Stone, Walter J.. 1996. Activists in the United States Presidential Nomination Process, 1980–1996 [computer file]. 2nd ICPSR version. Williamsburg, VA: Alan I. Abramowitz et al. [producers], 1996. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2001.
Abramowitz, Alan I., and Saunders, Kyle L.. 1998. “Ideological Realignment in the U.S. Electorate.” Journal of Politics 60: 634–52.
Abramowitz, Alan I., and Saunders, Kyle L.. 2008. “Is Polarization a Myth?Journal of Politics 70: 542–55.
Aldrich, John H. 1980. Before the Convention. Chicago: University of Chicago Press.
Aldrich, John H. 1983a. “A Downsian Spatial Model with Party Activism.” American Political Science Review 77: 974–90.
Aldrich, John H. 1983b. “A Spatial Model with Party Activists: Implications for Electoral Dynamics.” Public Choice 41: 63100.
Aldrich, John H. 1995. Why Parties? The Origin and Transformation of Political Parties in America. Chicago: University of Chicago Press.
Aldrich, John H., and Rohde, David W.. 2001. “The Logic of Conditional Party Government: Revisiting the Electoral Connection. In Congress Reconsidered. 7th ed., eds. Dodd, Lawrence C. and Oppenheimer, Bruce I.. Washington, DC: CQ Press, 269–92.
Andersen, T. W. 1957. “Maximum Likelihood Estimates for a Multivariate Normal Distribution When Some Observations Are Missing.” Journal of the American Statistical Association 52 (278): 200203.
Bentler, Peter M., and Bonett, Douglas G.. 1980. “Significance Tests and Goodness of Fit in the Analysis of Covariance Structures.” Psychological Bulletin 88: 588606.
Black, Earl, and Black, Merle. 1987. Politics and Society in the South. Cambridge, MA: Harvard University Press.
Black, Earl, and Black, Merle. 2007. Divided America. New York: Simon and Schuster.
Bollen, Kenneth A. 1986. “Sample Size and Bentler and Bonett's Nonnormed Fit Index.” Psychometrika 51: 375–77.
Bollen, Kenneth A. 1989. “A New Incremental Fit Index for General Structural Equation Models.” Sociological Methods and Research 17: 303–16.
Brewer, Mark D. 2005. “The Rise of Partisanship and the Expansion of Partisan Conflict within the American Electorate.” Political Research Quarterly 58: 219–30.
Brewer, Mark D., and Stonecash, Jeffrey M.. 2006. Split: Class and Cultural Divides in American Politics. Washington, DC: CQ Press.
Brownstein, Ronald. 2007. The Second Civil War. New York: Penguin Press.
Campbell, Angus, Converse, Philip E., Miller, Warren E., and Stokes, Donald E.. 1960. The American Voter. Chicago: University of Chicago Press.
Carmines, Edward G. 1991. “The Logic of Party Alignments.”Journal of Theoretical Politics 3: 6585.
Carmines, Edward G., and Stimson, James A.. 1989. Issue Evolution: Race and the Transformation of American Politics. Princeton, NJ: Princeton University Press.
Carsey, Thomas M., and Layman, Geoffrey C.. 2006. “Changing Sides or Changing Minds? Party Identification and Policy Preferences in the American Electorate.” American Journal of Political Science 50: 464–77.
Carson, Jamie L., Crespin, Michael H., Finocchiaro, Charles J., and Rohde, David W.. 2007. “Redistricting and Party Polarization in the U.S. House of Representatives.” American Politics Research 35 (6): 878904.
Cohen, Marty, Karol, David, Noel, Hans, and Zaller, John. 2008. The Party Decides: Presidential Nominations before and after Reform. Chicago: University of Chicago Press.
Converse, Philip E. 1964. “The Nature of Belief Systems in Mass Publics.” In Ideology and Discontent, ed. Apter, David E.. New York: Free Press, 206–61.
Conway, M. Margaret, and Feigert, Frank B..1968. “Motivations, Incentive Systems, and the Political Party Organization.” American Political Science Review 62: 1159–73.
Cox, Gary W., and McCubbins, Matthew Daniel. 1993. Legislative Leviathan: Party Government in the House. Berkeley: University of California Press.
Cox, Gary W., and McCubbins, Matthew Daniel. 2005. Setting the Agenda: Responsible Party Government in the U.S. House of Representatives. Cambridge, UK: Cambridge University Press
Davis, Otto A., Hinich, Melvin, and Ordeshook, Peter C.. 1970. “An Expository Development of a Mathematical Model of the Electoral Process.”American Political Science Review 64: 426–48.
De Boef, Suzanna L., and Keele, Luke. 2008. “Taking Time Seriously.” American Journal of Political Science 52 (1): 184200.
Downs, Anthony. 1957. An Economic Theory of Democracy. New York: Harper & Row.
Evans, Rowland, and Novak, Robert. 1966. Lyndon B. Johnson: The Exercise of Power. New York: New American Library.
Fiorina, Morris P., with Abrams, Samuel J. and Pope, Jeremy C.. 2005. Culture War? The Myth of a Polarized America. New York: Pearson Longman.
Richard, Fleisher, and Bond, Jon R.. 2004. “The Shrinking Middle in the U.S. Congress.” British Journal of Political Science 34: 429–51.
Freeman, Jo. 1986. “The Political Culture of the Democratic and Republican Parties.” Political Science Quarterly, 101 (3): 327–56.
Gerring, John. 1998. Party Ideologies in America, 1828–1996. Cambridge, UK: Cambridge University Press.
Gimpel, James G. and Schuknecht, Jason E.. 2001. “Interstate Migration and Electoral Politics.” Journal of Politics 63: 207231.
Granger, Clive W. J. 1969. “Investigating Causal Relation by Econometric and Cross-sectional Method.” Econometrica 37: 424–38.
Hacker, Jacob S., and Pierson, Paul. 2005. Off Center: The Republican Revolution and the Erosion of American Democracy. New Haven, CT: Yale University Press.
Herrera, Richard. 1992. “The Understanding of Ideological Labels by Political Elites: A Research Note.” Western Political Quarterly 45: 1021–35.
Jacobson, Gary C. 2000. “Party Polarization in National Politics: The Electoral Connection.” In Polarized Politics: Congress and the President in a Partisan Era, eds. Bond, Jon R. and Fleisher, Richard Washington, DC: CQ Press, 930.
Karol, David. 2009. Party Position Change in American Politics. New York: Cambridge University Press.
Kirkpatrick, Jeane J. 1976. The New Presidential Elite. New York: Sage.
Kline, Rex B. 1998. Principles and Practice of Structural Equation Modeling. New York: Guilford.
Krosnick, Jon A. 1990. “Government Policy and Citizen Passion: A Study of Issue Publics in Contemporary America.” Political Behavior 12 (1): 5992.
Krugman, Paul. 2002. “America the Polarized.” New York Times, Jan. 4: A21.
Layman, Geoffrey C. 2001. The Great Divide: Religious and Cultural Conflict in American Party Politics. New York: Columbia University Press.
Layman, Geoffrey C., and Carsey, Thomas M.. 2002a. “Party Polarization and ‘Conflict Extension’ in the American Electorate.” American Journal of Political Science 46: 786802.
Layman, Geoffrey C., and Carsey, Thomas M.. 2002b. “Party Polarization and Party Structuring of Policy Attitudes: A Comparison of Three NES Panel Studies.” Political Behavior 24: 199236.
Layman, Geoffrey C., Carsey, Thomas M., and Horowitz, Juliana Menasce. 2006. “Party Polarization in American Politics: Characteristics, Causes, and Consequences.” Annual Review of Political Science 9: 83110.
Lee, Frances E. 2009.Beyond Ideology: Politics, Principles, and Partisanship in the U.S. Senate. Chicago: University of Chicago Press.
Masket, Seth. 2007. “It Takes An Outsider: Extra-legislative Organization And Partisanship in the California Assembly, 1849–2006.” American Journal of Political Science 51 (3): 482–97.
Mayhew, David. 2002. Electoral Realignments: A Critique of an American Genre. New Haven, CT: Yale University Press.
McCann, James A. 1995. “Nomination Politics and Ideological Polarization: Assessing the Attitudinal Effects of Campaign Involvement.” Journal of Politics 57: 101–20.
McCarty, Nolan, Poole, Keith T., and Rosenthal, Howard. 2006. Polarized America: The Dance of Ideology and Unequal Riches. Cambridge, MA: MIT Press.
McClosky, Herbert, Hoffman, Paul, and O'Hara, Rosemary, 1960. “Issue Conflict and Consensus among Party Leaders and Followers.” American Political Science Review 54: 406–72.
Miller, Gary, and Schofield, Norman. 2003. “Activists and Partisan Realignment in the United States.” American Political Science Review 97: 245–60.
Miller, Gary, and Schofield, Norman. 2008. “The Transformation of the Republican and Democratic Party Coalitions in the U.S.” Perspectives on Politics 6: 433–50.
Miller, Warren E., and Jennings, M. Kent. 1986. Parties in Transition: A Longitudinal Study of Party Elites and Party Supporters. New York: Sage.
Noel, Hans. 2006. “The Coalition Merchants: How Ideologues Shape American Politics.” Ph.D. diss. University of California at Los Angeles.
Oldfield, Duane. 1996. The Right and the Righteous. Lanham, MD: Rowman & Littlefield.
Polsby, Nelson W. 1983. Consequences of Party Reform. Oxford: Oxford University Press.
Polsby, Nelson W. 2005. How Congress Evolves. New York: Oxford University Press.
Poole, Keith T., and Rosenthal, Howard. 2006. Ideology and Congress: 2nd, rev. ed. of Congress: A Political–Economic History of Roll Call Voting. New Brunswick, NJ: Transaction.
Rapoport, Ronald B., and Stone, Walter J.. 1994. “A Model for Disaggregating Political Change.” Political Behavior 16: 505–32.
Reichley, A. James. 1987. “The Evangelical and Fundamentalist Revolt.” In Piety and Politics: Evangelicals and Fundamentalists Confront the World, eds. Neuhaus, Richard John and Cromrartie, Michael. Washington, DC: Ethics and Public Policy Center.
Riker, William H. 1982. Liberalism against Populism: A Confrontation between the Theory of Democracy and the Theory of Social Choice. San Francisco: Freeman.
Rohde, David W. 1991. Parties and Leaders in the Postreform House. Chicago: University of Chicago Press.
Saunders, Kyle L., and Abramowitz, Alan I.. 2004. “Ideological Realignment and Active Partisans in the American Electorate.” American Politics Research 32: 285309.
Schattschneider, E. E. 1960. The Semisovereign People: A Realist's View of Democracy in America. Hinsdale, IL: Dryden Press.
Schlesinger, Joseph A. 1991. Political Parties and the Winning of Office. Ann Arbor, MI: University of Michigan Press.
Schofield, Norman, and Miller, Gary. 2007. “Elections and Activist Coalitions in the United States.” American Journal of Political Science 51: 518–31.
Schumpeter, Joseph A. 1942. Capitalism, Socialism, and Democracy. New York: Harper.
Sinclair, Barbara. 2006. Party Wars: Polarization and the Politics of National Policy Making. Oklahoma: University of Oklahoma Press.
Stone, Walter J. 1991. “On Party Switching among Presidential Activists: What Do We Know?American Journal of Political Science 35: 598607.
Stone, Walter J., and Abramowitz, Alan I.. 1983. “Winning May Not Be Everything, But It's More Than We Thought.” American Political Science Review 77: 945–56.
Stonecash, Jeffrey M., Brewer, Mark D., and Mariani, Mack D.. 2003. Diverging Parties: Social Change, Realignment, and Party Polarization. Boulder, CO: Westview.
Sundquist, James L. 1983. Dynamics of the Party System: Alignment and Realignment of Political Parties in the United States. Washington, D.C.: Brookings Institution.
Theriault, Sean M. 2008. Party Polarization in Congress. New York: Oxford University Press.
White, Theodore H. 1973. The Making of the President, 1972. New York: Bantam.
Wilcox, Clyde, and Larson, Carin. 2006. Onward Christian Soldiers? The Religious Right in American Politics. 3rd ed. Boulder, CO: Westview.
Wildavsky, Aaron. 1965. “The Goldwater Phenomenon: Purists, Politicians, and the Two-party System.” Review of Politics 27: 393–99.
Wilson, James Q. 1962. The Amateur Democrat. Chicago: University of Chicago Press.

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