The photograph showed the son, but my eye gravitated toward the mother. That first glimpse was surprising — the stout, pale-skinned woman in sturdy sandals, standing squarely a half-step ahead of the lithe, darker-skinned figure to her left. His elastic-band body bespoke discipline, even asceticism. Her form was well padded, territory ceded long ago to the pleasures of appetite and the forces of anatomical destiny. He had the studied casualness of a catalog model, in khakis, at home in the viewfinder. She met the camera head-on, dressed in hand-loomed textile dyed indigo, a silver earring half-hidden in the cascading curtain of her dark hair. She carried her chin a few degrees higher than most. His right hand rested on her shoulder, lightly. The photograph, taken on a Manhattan rooftop in August 1987 and e-mailed to me 20 years later, was a revelation and a puzzle. The man was Barack Obama at 26, the community organizer from Chicago on a visit to New York. The woman was Stanley Ann Dunham, his mother. It was impossible not to be struck by the similarities, and the dissimilarities, between them. It was impossible not to question the stereotype to which she had been expediently reduced: the white woman from Kansas.