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He initially supported Brian Pallister in the first round of the PC Party 's 1998 leadership election , though he later endorsed Joe Clark on the second ballot before Pallister officially withdrew .
 Brian Pallister, Joe Clark, Pallister
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Brian Pallister, Joe Clark, Pallister