These candidates have all been added to the bottom rung of the NRCC's list, which they call "On the Radar." The Republican House campaign committee has also bumped up nine previously-added names to their middle tier, "Contenders":
District
Candidate
AL-02
Martha Roby
CO-04
Cory Gardner
FL-12
Dennis Ross
ID-01
Vaughn Ward
MD-01
Andy Harris
NH-01
Frank Guinta
NM-02
Steve Pearce
OH-01
Steve Chabot
OH-15
Steve Stivers
Of those initial thirteen picks, four didn't make the jump: Van Tran (CA-47), Adam Kinzinger (IL-11), Charles Djou (HI-01), and Jon Barela (NM-01). (Kinzinger, for what it's worth, has been officially endorsed by the NRCC, the only candidate other than Dennis Ross in FL-12 to be so honored.) Two other dudes who were added later (but before this round) also stay put: David Harmer (CA-10) and Greg Ball (NY-19). I have to believe this means the GOP is writing off any hope of a stunning Harmer upset in next week's special election.
Interestingly, the NRCC seems to have no reservations about naming more than one candidates running in the same race to their program - they've done so in IL-10, MO-04, and NY-19. This is something I don't recall the DCCC doing with Red to Blue over the past couple of cycles. However, all of these multiple-choice challengers are still only at the "On the Radar" level. I wouldn't be surprised if the NRCC narrowed things down if certain candidates started to show more promise than others.