That's right...the color of his skin. It could no way be his policies, his cluelessness, his incompetence, his complete unfitness for his post, that he cannot even speak to 5th graders without a teleprompter to tell him what to say. It's because he has brown skin.
Were the challenges and adversities Bush, Reagan, et al faced from blacks "owing to the color of their skin"?
Of course not.
/sarc