That has a certain logic.
This may come off as sappy or overly-sentimental, but I feel like this photo could really be especially powerful to a young black or brown kid, say in a generation or so.
This country is pretty much built on the rhetoric that "you can be whatever you want to be", which of course anyone other than a highly educated, gifted, affluent, attractive white male knows is certainly not true. This photo is tangible proof for a black kid that the sky's the limit, whereas prior to this, no black kids had much of a reason to think that they could be president. It represents a steady progress towards equality amongst the races (an entirely imaginary and arbitrary human construct, by the way...an example of which you alluded to when you mentioned his bi-raciality being regarded simply as being black).
