As Mark A.R. Kleiman says, “If voters fail to become enraged at this sort of slime-mongering, Republicans may be emboldened to repeat it.”
Beware of outrage fatigue. Very very dangerous this time of year.
(On the other hand, there is a cheerful aspect to this. The more desperate and crazy the slime, the better the Democrats must be doing or why would the RNC/Bush crowd bother?)