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The son of alderman Thomas P. Keane and a member of the Democratic Party , he took his father 's seat in the Chicago City Council in 1945 , and represented part of the city 's Northwest Side .
 organization: Democratic Party
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Democratic Party 
Answer:
 organization: Democratic Party