Working paper On the Influence of Extreme Parties in Electoral Competition with Policy-Motivated Candidates Georges Casamatta, and Philippe De Donder IDEI Working Paper n. 161, 2003 ReferenceGeorges Casamatta, and Philippe De Donder, “On the Influence of Extreme Parties in Electoral Competition with Policy-Motivated Candidates”, IDEI Working Paper, n. 161, 2003.