You really believe that? I look at it differently. He knows Kerry isn't going to call for the other ads to stop, besides the FCC has already said they are legal under McCain/Feingold. They thought they put up a wall and the 527s drove a mack truck through them.
Not to mention this gives the RNC and the Presidents campaign a big opening to call on Kerry to stop hateful and viscious ads and denounce all 527's in a commercial, painting Kerry rather than Bush the bad guy.