I don't know what effect this next debate will have, do people care about foreign policy right now? I think a narrow Obama victory in the debate won't do much whereas a loss would hurt him quite a bit because then many voters will see Romney as competent on both domestic and foreign policy issues.
Romney's going to have a pretty hard time "winning". His only angles have been Benghazi and whining about not calling foreign leaders and countries enough names. His Benghazi arguments have been butchered over the last week.