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Mr . Kubba is a senior fellow at a think tank called the National Endowment for Democracy .
 a think tank called the National Endowment for Democracy, the National Endowment for Democracy, Mr, Mr . Kubba, a senior fellow at a think tank called the National Endowment for Democracy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 a think tank called the National Endowment for Democracy, the National Endowment for Democracy, Mr, Mr . Kubba, a senior fellow at a think tank called the National Endowment for Democracy