Symbolism is extremely powerful which is why companies have logos, hollywood actors are generally really good looking people and also why Cam Newton has so many defenders after his pitiful and childish behavior post-super bowl. Look at the symbolism on the coli.com logo right now. Symbols are what the white power structure is using to brainwash America and the world about black people on the 6 o'clock news every night.
Then at the shallow and "symbolic" level, Ob@ma fails as a symbol to change how people view black americans and/or improve black american's lives from being killed by police unfairly based on how racism is even stronger today and is running rampant while he is in office and the only thing he does to respond to the racist activity is to call black children thugs.