An interesting theory, but in short: No
Here's the deal, MSM picked up on what some black people like Samuel L Jackson, said they voted for Pres Obama because he's black. This is partly true because black people do believe other black politicians understand our problems more than a white person. However, if black people feel comfortable with a white candidate, we will vote for them. Let me give you an example, down here in New Orleans over 80 percent of African Americans voted for a white candidate for mayor over blacks. African Americans trusted Mitch Landrieu over all candidates including those who are black.
When then Senator Obama first ran for president I wasn't drawn to him by the color of his skin, nor were my family and friends. Inside the barber shop is usually where black people gossip and talk about news. I remember before the Iowa caucus, people were suspicious of Senator Obama and were supporting Hillary Clinton. The Clintons were/are gold in our community and last I checked they both are white. Remember, before Iowa Hillary had majority support from African Americans. When Senator Obama won Iowa it was a wow moment. Iowa is one of the whitest states in our union, so many of us had to give a second look at Obama. This was gradual, but after a few states, Senator Obama had the black vote. It can be argued that African Americans are inherently suspicious.
If President Obama were an idiot I doubt very seriously Barack Obama would have won black votes. Yes, it's somewhat tribal now, but it's only because we know President Obama understand us. African American take voting for presidency very seriously. If there were talk that Obama wanted to go war, makes serious social cuts, a 'C' student in college, you know like a 'black W. Bush,'no blacks would vote for him.
Just to further prove blacks don't just vote for blacks, on night this past election I told my mother, Alan West lost(to a white candidate) and her response was 'thank god.' She is old school black social conservative: church goer. If Obama never ran for president and Hillary Clinton was running against Herman Cain or Condoleezza Rice, I still believe Hillary would win over 90 percent of black vote. Herman Cain is an idiot and there would be a fear that Cain might push us into nuclear war. Rice has a lot problems, mainly she was a Bushie. I would say Gen. Powell was popular in black community until he join Bush admin.
I'm sure there is a percentage of blacks voted for Obama because of his race, as I am sure some white people voted for Romney because of his race. African Americans were excited in 2007/08 on the possibility having black president and re-electing a black president. Shouldn't we?