And then there was Bob Kerrey, the former senator and another Clinton supporter, who slimed up the campaign with the following comments:

“It’s probably not something that appeals to him, but I like the fact that his name is Barack Hussein Obama, and that his father was a Muslim and that his paternal grandmother is a Muslim. There’s a billion people on the planet that are Muslims, and I think that experience is a big deal.”

Image Bob Herbert

Pressing the point, Mr. Kerrey told CNN’s John King: “I’ve watched the blogs try to say that you can’t trust him because he spent a little bit of time in a secular madrassa. I feel quite the opposite.”

Get it?

Let’s start with the fact that Mr. Obama never attended a madrassa, and that there is no such thing as a secular madrassa. A madrassa is a religious school. Beyond that, the idea is to not-so-slyly feed the current frenzy, on the Internet and elsewhere, that Senator Obama is a Muslim, and thus potentially (in the eyes of many voters) an enemy of the United States.

Mr. Obama is not a Muslim. He’s a Christian. And if he were a Muslim, it would not be a legitimate reason for attacking his candidacy.

The Clinton camp knows what it’s doing, and its slimy maneuvers have been working. Bob Kerrey apologized and Andrew Young said at the time of his comment that he was just fooling around. But the damage to Senator Obama has been real, and so have the benefits to Senator Clinton of these and other lowlife tactics.

Consider, for example, the following Web posting (misspellings and all) from a mainstream news blog on Jan. 13:

“omg people get a grip. Can you imagine calling our president barak hussien obama ... I cant, I pray no one would be disrespectful enough to put this man in our whitehouse.”

Mr. Obama’s campaign was always going to be difficult, and the climb is even steeper now. There is no reason to feel sorry for him. He’s a politician out of Chicago who must have known that campaigns often degenerate into demolition derbies.