2880
Viewed during the 1960 s and the early 1970 s as a progressive within the CDU , he was elected national chairman of the party in 1973 .
 organization: CDU
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: CDU