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In his victory speech , he attacked president Barack Obama , saying " we are here to collect " on a statement the president made in 2009 that he would be a one-term president if the economy did not turn around .
 Barack Obama
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Barack Obama