Doubtful that Saccone will win the mail in ballot.. and even if he does pull this off, the fact it was even close shows the messaging used by republicans in this race will not drive turnout.
November they will certainly lose 23 seats or more if their messaging is what for this race is their plan for the fall. There is no excuse for this race to even being close other than the republicans ran a campaign with terrible and incorrect messaging.
It also shows you can't just put up any shmoe wearing a red MAGA cap. Saccone was an awful candidate.