From Charles M. Blow:
Obama was a phenomenon. He was elegant and cerebral. He was devoid of personal scandal and drenched in personal erudition. He was a walking, talking rebuttal to white supremacy and the myths of black pathology and inferiority. He was the personification of the possible — a possible future in which legacy power and advantages are redistributed more broadly to all with the gift of talent and the discipline to excel.
It is not a stretch here to link people’s feelings about Obama to their feelings about his blackness. Trump himself has more than once linked the two.