Even if Busby loses tonight (which looks more likely, sadly) she still has a second shot come November against Bilbray. Tonight's race is only to fill the remainder of DUke Cunningham's term.
If Busby wants to defeat Bilbray, however, BEGINNING IMMEDIATELY, she needs to continue running ads against Bilbray. She also has time to neutralize the immigration slander from the right, and has time to prepare in case they try again. Also, if turnout really was as low as people think, what's not to say that people haven't been paying attention to the bullshit lies? Also, if Busby can continue to make this race close, then the NRCC will have to pour MORE $$$$$ into this race, which will divert from other competitive contests.