I mention 'memetics' in the introduction to this blog. Karl Rove is a practitioner of memetics. His job is to affect the individual perception of susceptible populations by infecting the world-view of the perciever; by 'coloring' the lens through which the viewer percieves events.
Thus a war hero can be made a coward; a thoughtful opinion can be cast as dull; a strong legislative record percieved as wishy-washy. On the other hand, an AWOL air guardsman can be turned into a Commander-in-Chief and a bungled Iraqi occupation into an war on terror.
Insulating the well-groomed minds of Bush supporters from opposing views only requires implanting a viral codec that would 'color' media presenting such points of view as the products of 'liberal' press or 'foreign' media.
See the referenced site for more on memetics, particularly the Dawkins piece: