3751
He then worked as an adviser to Senator Graham Richardson who held the environment and social security portfolios in the Bob Hawke and Paul Keating federal governments .
 person: Graham Richardson; person: Bob Hawke; person: Paul Keating
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Graham Richardson; person: Bob Hawke; person: Paul Keating