Oh, those finicky voters.
Just a month ago bush received a 52% approval rating in California and now it is down to 43%. The director of the Field Poll Mark DiCamillo:

…called those figures “damning,” saying voters’ lack of trust in Bush undermined their views of his performance on a range of issues.

Sure, but these numbers could just as easily swing back the other way next month or in October. bush’s handler’s are certainly quite busy looking for the issue(s) and events to make this happen.