I have no idea why someone who is mixed race might be more susceptible to careerism than someone who is white, but...
i can...further to fall, higher odds to beat, both can focus the mind quite well.
great reply, full of good points, thanks Upstate.
perhaps it was not necessary to include that factor, if it seemed crass in any way, i apologise. ~"When an inner situation is not made conscious, it appears outside as fate." Karl Jung~
In that context, Obama's actual race is much less a factor than his perceived race.