Bush might want look back to successful predecessors for pointers. Other presidents have recovered from ratings slumps like the one Bush is in right now: Dwight Eisenhower came back after the Sherman Adams scandal; Ronald Reagan rebounded after Iran-Contra; Bill Clinton triumphed after Monica Lewinsky.
But Clinton never had a serious ratings slump because of the Lewinsky scandal. According to Gallup his lowest post-Monica revelation job approval rating was a shocking 57%.
Monica was a scandal for the media, not the country. It's time they came to understand that.