Having been pretty much proven wrong on reading these ads once, I'm loathe to say I think doing them is too risky, but I still think you play low key and let things fester.  I thought it was risky based on the potential for Hillary to smack McCain for them then, and I think now you run the risk of overdoing it enough to turn off Clinton supporters.  Yes, I realize she has interest in seeing Obama tank and personal animosity, but party politics sometimes override that.

(h/t)