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After decades of relative continuity, the Christian Democratic Union began making major modifications in its basic policy orientations after 1998. These waves of modernisation largely vindicate traditional explanations of party change, as they resulted from a combination of external shocks (electoral decline); leadership transition (Angela Merkel's consolidation of power); and internal factional change (weakening of the CDU's traditional conservative and social wings, along with the growing influence of its pro-market and culturally liberal elements). Yet the nature of Merkel's leadership and absence of a dominant internal coalition in the CDU often gave this policy change an ad hoc, inconsistent character.
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Clay Clemens (2009) studied this question.
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