Mathias Poertner is Assistant Professor of Political Science at the London School of Economics and Political Science. His research on social identities and political participation lies at the intersection of political behavior, comparative politics, and political methodology. Mathias is co-author of Native Bias: Overcoming Discrimination Against Immigrants (2022).

'How do some new parties gain support and endure? This innovative and rigorous analysis argues that, surprisingly, civil society organizations reassure and guide voters, communicating party messages, persuading potential voters, and building lasting partisan attachments. An indispensable book for scholars of party politics and representation.' Anna Grzymala-Busse, Michelle and Kevin Douglas Professor of International Studies, Stanford University

• List of figures; List of tables; Acknowledgments; 1. Introduction: the organizational roots of new parties; 2. Explaining mass support for new parties; Part I. Development of Mobilization Strategies: 3. Mediated appeals through peak associations: MAS in Bolivia; 4. Direct appeals: Alianza PAIS in Ecuador; 5. Mediated appeals through local associations: MORENA in Mexico; Part II. Implications for Mass Support: 6. Mechanisms of electoral support: Bolivia and Ecuador; 7. Resulting electoral support: Mexico; 8. Resulting party identification: Bolivia, Ecuador, and Mexico; 9. Conclusion: New parties, Societal organizations, and democracy; Bibliography.

Mathias Poertner is Assistant Professor of Political Science at the London School of Economics and Political Science. His research on social identities and political participation lies at the intersection of political behavior, comparative politics, and political methodology. Mathias is co-author of Native Bias: Overcoming Discrimination Against Immigrants (2022).

'How do some new parties gain support and endure? This innovative and rigorous analysis argues that, surprisingly, civil society organizations reassure and guide voters, communicating party messages, persuading potential voters, and building lasting partisan attachments. An indispensable book for scholars of party politics and representation.' Anna Grzymala-Busse, Michelle and Kevin Douglas Professor of International Studies, Stanford University

• List of figures; List of tables; Acknowledgments; 1. Introduction: the organizational roots of new parties; 2. Explaining mass support for new parties; Part I. Development of Mobilization Strategies: 3. Mediated appeals through peak associations: MAS in Bolivia; 4. Direct appeals: Alianza PAIS in Ecuador; 5. Mediated appeals through local associations: MORENA in Mexico; Part II. Implications for Mass Support: 6. Mechanisms of electoral support: Bolivia and Ecuador; 7. Resulting electoral support: Mexico; 8. Resulting party identification: Bolivia, Ecuador, and Mexico; 9. Conclusion: New parties, Societal organizations, and democracy; Bibliography.

Mathias Poertner is Assistant Professor of Political Science at the London School of Economics and Political Science. His research on social identities and political participation lies at the intersection of political behavior, comparative politics, and political methodology. Mathias is co-author of Native Bias: Overcoming Discrimination Against Immigrants (2022).

'How do some new parties gain support and endure? This innovative and rigorous analysis argues that, surprisingly, civil society organizations reassure and guide voters, communicating party messages, persuading potential voters, and building lasting partisan attachments. An indispensable book for scholars of party politics and representation.' Anna Grzymala-Busse, Michelle and Kevin Douglas Professor of International Studies, Stanford University

• List of figures; List of tables; Acknowledgments; 1. Introduction: the organizational roots of new parties; 2. Explaining mass support for new parties; Part I. Development of Mobilization Strategies: 3. Mediated appeals through peak associations: MAS in Bolivia; 4. Direct appeals: Alianza PAIS in Ecuador; 5. Mediated appeals through local associations: MORENA in Mexico; Part II. Implications for Mass Support: 6. Mechanisms of electoral support: Bolivia and Ecuador; 7. Resulting electoral support: Mexico; 8. Resulting party identification: Bolivia, Ecuador, and Mexico; 9. Conclusion: New parties, Societal organizations, and democracy; Bibliography.