Brown has already pledged his allegiance to Romney. If Scott Brown is neutered by Palin, then she focus on Rove, Schmitt, Coulter, and other obstructions before turning her sights on Romney. Neutering Scott Brown is Job #1 for Palin, Talk Radio and The Tea Party right after the mid-terms.
Why do you see Brown as such a threat? Sure, he’ll back Romney but I don’t think he’s the type to play anyone’s attack dog.