52879
In 1974 , O'Shaughnessy overcame a divisive primary and a challenge by Republican Keith McNamara to retain the seat .
 O'Shaughnessy, Republican Keith McNamara
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 O'Shaughnessy, Republican Keith McNamara