Slowly, I'm beginning to understand the freight of meaning in President Barack Obama's comment that Trayvon Martin could have been him. George Yancy's "Walking While Black in the 'White Gaze' " in The New York Times sent shivers down my spine. Fifty years ago, he was a kid in north Philadelphia carrying a telescope, and a white police officer said to him, "Man, I almost blew you away. I thought you had a weapon." Yancy says he's waiting for the day a white president says, "There is no way that I could have experienced what Trayvon Martin did (and other...