I found this when doing a search on "culturally black" on Yahoo! Not a bad read, and what I found interesting is that McWhorter's not necessarily comfortable being embraced by white conservatives and voted for Ralph Nader. It seems that he's considered "conservative" because some of his beliefs veer from the Rev. Al/Jesee (sic) line:
http://reason.com/0110/fe.cy.internal.shtml