"So, who has been harmed more this week by their surrogates? Obama or Clinton?"

If that was the point of the editorial, they have both been harmed. But whether that translates to people diggin' in deeper or voting 'outside' their Party when the Dems have one and the Reps have one is an issue that will only be quantifiable after the votes have been cast in the presidential race.

The people who are hurting Obama, Clinton and McCain (it seems to be hurting him less. Maybe folks just expect that of Republicans) may not see that what they do is contraindicated in terms of voters' perceptions. Right now it's a fight inside the Dem Party. ONE of the two will win the nomination race, so it might be seen by their managers as a "let's do as much damage as we can to the other candidate because we have nothing to lose in THIS race". Whether that translate to long-term problems may be someting no one's looking at yet.