I'd have no problem with Bilbray if he wanted a rematch with Susan Davis, I just think he is a poor fit for this seat. I prefer Kaloogian over Morrow, but both are good men. I don't know what is the deal with Roach, and I tend to be very wary of rich guys coming in trying to buy a seat in a seat that doesn't require buying (if he wants to do it with a Dem-held seat, again, be my guest). The two Republicans that come to mind that did that were no gems, Darrell Issa being one, and Michael Huffington being the other (and his little stunt ended up turning a safe GOP seat into a Democrat one).
The Davis seat is now a gerrymandered Dem bastion. This seat in the bad GOP climate right now is marginal however, the most marginal in San Diego county. Bush carried it by about 10%, and it is slowly trending Dem. It is too close to San Diego, and not exurban enough. The big GOP precincts in San Diego County are in Issa's and that House check kiting guy's districts, whose name escapes me for the moment. I think it is Hunter, no?