IMHO, I think that effect is overrated for a number of reasons:
Last November the GOP got 60% of the white vote for the first time in history. I doubt that they will get much less than that in the future. I think the rats may have lost a significant number of the "Jacksonian Democrats" for good.
These educated blacks "acted white" in school. There's much more reason to think they would vote like Thomas Sowell or the late Republican Martin Luther King Jr. than Jesse Jackson Jr.
If they are liberals, they will only have an effect in races that are close statewide races for governor or competitive districts and votes for referenda/initiates. Most Congressional and state legislative districts are gerrymandered, especially "majority" minority districts mandated from D.C. by the Voting Rights Act.
It's kind of lame that it's only 60% nationwide. In some southern states, it's 80%. If we could get 80% nationwide, or even 70%, the Democrats would become perennial also-rans.
>>There’s much more reason to think they would vote like Thomas Sowell or the late Republican Martin Luther King Jr. than Jesse Jackson Jr.<<
I would like to think so but it’s going to take a decade or so to actually get the numbers out.