The ad the Rick is running in MI is funny as hell.
It shows a romney look a like with an automatic mud gun shooting at but missing, Rick cardboard targets and in the end getting mud on his nice white shirt.
Very effective parody on mittens mud slinging and it will work without being nasty.
I had to track that ad down after you mentioned it - it is very good!
http://www.youtube.com/watch?v=OtOcrS6axnE
The thing about that “Rombo” ad is that it paints Romney as sort of a goof ball caracature. They should continue this with other ads using the same actor portraying Mitt doing stupid things. Then when folks see the real Mitt, they immediately compare him to the goof ball and no one will take him seriously. Eventually Mitt becomes the actor in the ads. No one wants to vote for a cartoon. Perfect.