8556
He decided to run for the U.S. Senate again in 1994 to challenge incumbent  Democrat  U.S. Senator  Chuck Robb  in the Democratic primary .
 employee of: Democrat, Chuck Robb
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: Democrat, Chuck Robb