7170
He was originally appointed by President George W. Bush and was retained for service by President Barack Obama .
 person: George W. Bush; person: Barack Obama
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: George W. Bush; person: Barack Obama