• Luiz Ignazio Lula Da Silva, former President of Brazil
• Massimo D'Alema, former Prime Minister of the Republic of Italy
• Attila Mesterházy, President of the Hungarian Socialist Party
• Antonio José Seguro, General Secretary of the Portuguese Socialist Party
• Pier Luigi Bersani, General Secretary of the Italian Democratic Party
• Victor Ponta, President of the Rumanian Social Democratic Party
• Raymond Johansen, General Secretary of the Norwegian Labour Party
• Ousmane Tanor Dieng, General Secretary of the Socialist Party of the Republic of Senegal
• Lilianne Ploumen, President of the Dutch Labour Party
• José Luis Rodríguez Zapatero, President of the Government of Spain
• Alfredo Pérez-Rubalcaba, candidate for President of the Government of Spain
• Felipe González, former President of the Government of Spain
• José Miguel Vidal Zapatero, Assistant Director of the Cabinet of the President of the Government of Spain
• Andrés Ortega, Director of the Analysis and Studies Department of the Cabinet of the President of the Government of Spain
• Elena Valenciano, PSOE Secretary for International Policy
• Jesús Caldera, Vice-President of the IDEAS Foundation
• Carlos Mulas-Granados, Director of the IDEAS Foundation