I've been pondering this since around the early 1980s.
I had a long personal history to attach here as a "so-called" Caucasian who no longer likes the black/white distinction. Only at age 65, I had learned through genealogical research how my own Polish-American family of the first 3 generations of settlers (1850) were treated by the Texas Anglos. The Poles were conscripted by the Confederacy. They deserted, so they could exchange gray uniforms for blue, and were known as "The Polish Grays." After WWI, there was a strong anti-immigrant sentiment across the country. My father and his siblings were regularly beaten by the little bigot cornpones when they attended the first public school in the town.
After age 9, my father wasn't alive to tell me any of this.
I think there's a behavior I could call "racial cowardice," which I could only apply to myself -- growing up in various modestly-tony suburbs of the Midwest and California. On the one hand, a person might say "I'm not prejudiced," but might worry "what people will think" for having black friends or more formal situations in the workplace.
When I was finishing my UC college-career, the big headlines here focused attention on the murder of two cops: Christensen and Teil. Three black men were rounded up in a dragnet -- known as the Riverside Three. None of them had ever met until after their arraignment: A USMC Marine Corps veteran and "community organizer" -- his wife a nurse at the local hospital; a college student from a JC in Bishop -- originally from Alabama -- who happened to be transferring to UC and stumbled into the dragnet; and a rather simple but polite hulk of a young man with whom I was acquainted as a neighbor about two years before the murders.
Those guys were all railroaded through three trials which destroyed their lives. But not only were they "not guilty." They were innocent.
So move on to living and working in the Washington bureaucracy. Maybe through the first ten years, I began to think that the Civil Rights era had done its work. There was no more distinction between "black" and "white." But with the influx of GOP underlings of the early-to-mid 1980s, I began to notice what the white-boy growing up in an all-white neighborhood, who believed the story-line in the newspapers about the Riverside Three, who had gone out on weekend nights with white cronies to find "some old black guy" to buy our booze for us -- failed to see before.
People aren't going to "tell you" about the slivers of subtle attitudes they harbor.
So I'd say --- look at Colin Powell's experience during the Bush administration, and his occasional statements in the media before, during and after he ended his tenure as Secretary of State. And he had some observations about how his own party was treating Obama. Like me, I think he must've had an epiphany of "waking up."
To say that Obama is responsible for some sort of "racial division" is like saying about a KKK lynching: "It was the black guy's fault."
It's one thing to criticize the Prez. It's another thing to do everything possible to hamstring and obstruct. And it's difficult to sort out. They'll say "Ah don' like him cuz he's a so-oo-shal-ist!" Or they'll lay down a lambast of the ACA. Or they'll say he's spineless for not playing Emperor Commodus like Bush, trying to show the world we can wage two wars at once. But between whining about Reverend Wright, resolving to make him a "one-term president" and other things, you see things coming from that part of the electorate with similar inclinations like "He's a half-breed!"
Do we somehow now "wish" that we'd elected Hillary instead? I think -- if you entertained that notion -- it's a manifestation of "racial cowardice." And for someone who voted for him holding that sentiment now, I'd be happy to sell you out to "international communism" or Hells Angels, then go down to the post office and salute the flag. It's one thing to put on a sheet and burn a cross. It's another thing to be a spineless wretch.