I ask the question as though I had a solid answer, but I'm hoping for help from readers with more extensive mental catalogs of what races celebrities belong to. A recent Steve Sailer post on Alicia Keys' race radicalism explored the issue somewhat, with many suggesting that once the Black father leaves the family, the biracial kid identifies with the missing parent in an attempt to establish some connection, which in cases like Alicia Keys or Barack Obama means dialing up their Blackness.
Actually, let me pause for a second to point out that a commenter in one of my posts somewhere suggested Alicia Keys as a good female role model for not being slutty or gangsta, and pretty enough for girls to pay attention to. That may be true, but she's pretty much ruined now. I would suggest instead Mya. She graduated high school at 16, is not skanky or gangsta, and is much better-looking than Alicia Keys, who has a somewhat mannish face. Yeah, let me think about that for a bit. That song of hers is right: her ass is like whoa (could be a little bigger, though maybe they Photoshopped it to placate the booty-phobic majority). Most importantly, she is not a dopey race radical.
Back to the main topic, the assumption that biracials become more race-radical due to identifying with the missing parent relies on them coming from a Black father / White mother marriage -- males are more likely to leave the mother with the kids than vice versa, and if the White father left, that wouldn't lead to race radicalism since the missing parent would be White.
So what about biracials who come from the rarer type of Black mother - White father marriage? Lenny Kravitz and Slash (from Guns 'n' Roses) are the only examples I can think of, and they certainly don't seem to be very race-radical. Too bad David Bowie's wife Iman didn't squeeze one out, or we'd have another well known data-point. Any ideas on whether the kids from these types of interracial marriage are less race-radical?
Assuming -- and it's a big assumption -- that this pattern holds, what would cause it? I think it has to do with the personalities of the parents, which all parents pass on to their kids to some degree. The White mother in an interracial marriage seems to be very exotophilic, Obama's mother being a good case-in-point. (The Black father may also be this way, though I don't think his exotophilia score needs to be very high to enter into such a marriage, whereas the White mother's score has to be very high.) So even if the father did stick around, the kid would partly inherit the exotophilic tendencies of the mother and get turned on by (rather than simply appreciate) Black culture and race radicalism.
For the Black mother / White father case, neither seems to be very exotophilic. It's tough for Black women to be exotophilic because the males of other races tend not to be as strong-minded and assertive as they are themselves: "White men are just too wimpy for me." And exotophilic White males tend to go for Latin Americans of all colors, East Asians, and the duskier White females -- Italian, Persian, Jewish, etc. So, it's far less likely in this case that even one of the parents will have a high exotophilia score, and thus it's far less likely that the kid will inherit a high score.
It would be hard but not impossible to dig up data that would shed light on this. Children of Black mother / White father marriages are pretty darn rare, and a typical psychological study doesn't look at how they score on exotophilia or race-radicalism -- grades in school, height, maybe personality, but not this. Failing that, we could just look at celebrities since their racial backgrounds are well known, as are any weird political views they may have. Any ideas?
Or we could look at cases where the Black father stayed around with the White mother. My prediction is that their kids will still be more race-radical than those from Black mother / White Father marriages. Mya is actually one case -- her dad stayed around till she was an adult, and she goes against my prediction, but she's just one data-point. Everyone knows you need at least two before you see a pattern, jeez.