Republicans accept a tough loss all the time with class and tact. This is sometime (actually almost always) despite real issues with RAT cheating and voter fraud.
If it is a real and legitimate loss, fine.
In the case of Bob Dornan in California some years ago, it was plain that Sanchez stole the election.
The GOP refused to fight against the obvious voter fraud.
If it was a RINO or a liberal republican they probably would have.