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1996 Ontario election He campaigned for the Legislative Assembly of Ontario in a 1996 by-election in York South , as a candidate of the Progressive Conservative Party when New Democratic Party ( NDP ) leader Bob Rae vacated his seat .
 Ontario, Ontario, Progressive Conservative Party, New Democratic Party, Bob Rae
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ontario, Ontario, Progressive Conservative Party, New Democratic Party, Bob Rae