If you subtract deaths due to hostile action that leaves Bush with 9128 (note: I basically averaged the two years prior for 2007 and projected 2008 the number I decided on was 3700 for the two years combined and 1500 due to hostile action).
Clinton would be left with 6996. 2100 less. Factor in that Clinton served during peacetime and you can say that they are pretty much even.
However, Bush isn't getting hammered on the 9128 soldiers that died in other ways, he is getting hammered on the ones that died in combat.