SELECT avg(T1.Votes) FROM election AS T1 JOIN representative AS T2 ON T1.Representative_ID  =  T2.Representative_ID WHERE T2.Party  =  "Republican"
What is the average number of votes of representatives from party "Republican"?
[Schema (values) (types)]: | election_representative |  election : election_id (text) , representative_id (number) , date (number) , votes (text) , vote_percent (number) , seats (number) , place (number) | representative : representative_id (text) , name (number) , state (number) , party (text) , lifespan (number);