Cain has been doing the dirty work for the Mittens. I guess he figures that if he brings down Perry, Mitt wont reveal any goodies from the bag of tricks with Herbie's name on it. Heck, if Cain can accuse Perry with impunity and without evidence, no one dare to tell me not to accuse Mitt of having a bag of goodies filled with unflattering stories about the Cainster.
:o)