Cunningham has already tendered his resignation: http://www.freerepublic.com/focus/f-news/1529978/posts
Hopefully conservatives will clear the field for Kaloogian to ensure that he defeats whichever RINO runs and, hopefully, get 50% in the first round and avoid a run-off.
At least Cunningham had the courtesy not to drag it out. Kaloogian doesn't have a free ride. Another individual mulling the race in ex-Coronado Rep. Brian Bilbray (he moved up there). Bilbray was fine for his old seat, but he's too liberal for this particular district. Susan Golding, the old RINO Mayor of San Diego is also a potential candidate, as is Bill Morrow, Bill Horn, and Charlene Zettel. Kaloogian is clearly the best of the bunch.