Ed Helms?
Seriously?
The whole reason that Nielson worked as Drebin was because he played it 100% straight and looked like a guy who played a homicide cop (and often did) in cheesy 60s and 70s cop shows.
The only way this would/could work is if you get the same kind of actor, someone who could've been a cast member on Law and Order or some such show. Helms is not that type of actor.
