This book discusses the life and professional struggle of Kemal Klçdarolu and the transformation of the CHP under his leadership. It deals with the transformational periods and phases of the CHP, up to the period when Kemal Klçdarolu became prominent in the party. The CHP’s transformation and how it variously affected its popular standing in public opinion and revealed political liabilities and limitations cumulatively can indicate and explain to what extent political parties are likely to change as leadership changes and different regime governing approaches take hold. Furthermore, this book aims to answer the following questions: How and for what reasons did Klçdarolu decide to ally with the center-right wing in the CHP? What was the collective impact of the center-right wing in positive and negative terms regarding the CHP’s general identity, especially in historical context? After the 2015 elections, what constituted the shifts and revisions in Klçdarolu’s ideology andhow did they alter the political power of the CHP as a major opposition party? What evidence exists to shed light on his capabilities for building coalitions as a viable option for the possibility of forming a national government in elections?