In 2004 there was a concerted effort by network producers at the Big 3 television networks to show the immediate reaction of either candidate to the other's stance. This was a departure from the tradition of giving the speaking candidate either the undivided attention of the cameras, or, in the case of interruptions by either candidate, casting either in a panoramic view.
It's just a feint, and quite frankly boneheaded ploy to create an semblance of artificial restraint by the candidates. The radical side of saint influence at work: masking the problem because it's too hurtful to hear about, I guess. People were upset -- all of a sudden -- when they saw Kerry and Bush go at it. That said, I think that it was just the conservative communitarian swing voters who were upset, because they think they have to be the final judges of how people react to each other. In any case, an itty bitty minority is a voting minority, so there ya go.