Romney should be harping on this issue.. 'Obama's only achievement is the killing of somebody'.. 'Obama's so desperate he's using Hollywood to try and get re-elected'... 'Obama sold out on classified information so Sony pictures could make a movie about the OBL mission'... 'Obama will focus on Osama while our economy goes down the tubes'.. etc.
In another words, Romney should prepare Americans for what otherwise would be an October surprise which could help Obama. Romney should diminish or marginalize the 'surprise' element here.