Mark Shields, on Friday's NewsHour, finally illuminating his opposition to MoveOn's Petraeus ad:

First of all, Americans do not like to have people's names made fun of. Everybody has had the experience him or herself at one time in life having their own name made fun of. And to do it in this unflattering, unfair fashion was beyond the pale.

As you might imagine, I don't have any real problem with the ad, and I'd wondered why Shields had reacted to it the way he did. That quote sure seems to explain it, though: Mark Shields was emotionally scarred by name-calling elementary schoolers.