On Friday President Obama picked at America’s racial wound, and it bled a bit.

Despite persistent attempts by some to divest the Trayvon Martin-George Zimmerman tragedy of its racial resonance, the president refused to allow it.

During a press briefing, Mr. Obama spoke of the case, soberly and deliberately, in an achingly personal tone, saying: “You know, when Trayvon Martin was first shot I said that this could have been my son. Another way of saying that is Trayvon Martin could have been me 35 years ago.”

With that statement, an exalted black man found kinship with a buried black boy, the two inextricably linked by inescapable biases, one expressing the pains and peril of living behind the veil of his brown skin while the other no longer could.

With his statements, the president dispensed with the pedantic and made the tragedy personal.

He spoke of his own experiences with subtle biases, hinting at the psychological violence it does to the spirit — being followed around in stores when shopping, hearing the locking of car doors when you approach, noticing the clutching of purses as you enter an elevator.