Gee, I wonder why, if you have a black man running for high public office  say, Barack Obama or Harold Ford  the opposition feels compelled to run low-life political ads featuring tacky, sexually provocative white women who have no connection whatsoever to the black male candidates.

Spare me any more drivel about the high-mindedness of John McCain. You knew something was up back in March when, in his first ad of the general campaign, Mr. McCain had himself touted as “the American president Americans have been waiting for.”

There was nothing subtle about that attempt to position Senator Obama as the Other, a candidate who might technically be American but who remained in some sense foreign, not sufficiently patriotic and certainly not one of us  the “us” being the genuine red-white-and-blue Americans who the ad was aimed at.

Since then, Senator McCain has only upped the ante, smearing Mr. Obama every which way from sundown. On Wednesday, The Washington Post ran an extraordinary front-page article that began:

“For four days, Senator John McCain and his allies have accused Senator Barack Obama of snubbing wounded soldiers by canceling a visit to a military hospital because he could not take reporters with him, despite no evidence that the charge is true.”