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Pat Toomey a Republican former Congressman representing the Lehigh Valley-based 15th congressional district had previously challenged incumbent  Arlen Specter  in the  Republican  primary of the 2004 Senate race in which the conservative Toomey tried to portray Specter as too liberal .
 employee of: Arlen Specter, Republican
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 employee of: Arlen Specter, Republican