Oh he knew what kind of guy he was hiring. It's a Clinton tactic: sic a political attack dog on enemies while the candidate appears to stay "above it all", occasionally swatting the dog with a newspaper if he gets, uh, out of line.
Huckabee's "I'm not airing this negative ad I made yesterday" stunt is an example of this.
Huckabee cannot win the big states and could not go into the convention with a majority - bottomline.