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On December 1 , 2008 , President-elect Obama announced that Robert Gates would remain in his position as Secretary of Defense during his administration , Gates was the fourteenth Cabinet member in history to serve under two Presidents of different parties , and the first to do so as Secretary of Defense .
 person: Obama; person: Robert Gates; person: Gates
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:
 person: Obama; person: Robert Gates; person: Gates