Well ... though I'd heard and read 92% in many places since the election was held here's verification: [www.cnn.com] from CNN.

Then in wikipedia (http://en.wikipedia.org/wiki/United_States_presidential_election,_2008) <- lots more data here, but the relevant synopsis is here-> regarding the election results:The election saw increased participation from African-Americans. African Americans made up 11.1% of the electorate in 2004, versus 13.0% in 2008.[189] According to exit polls, over 95% of African Americans voted for Barack Obama. This played a critical role in southern states such as North Carolina. 74% of North Carolina's registered African American voters turned out, as opposed to 69% of North Carolinians in general, with Obama carrying an unprecedented 100%[citation needed] (with rounding) of African American females and African Americans age 18 to 29, according to exit polling.[190] This was the case in Virginia as well where much higher turnout among African Americans propelled Obama to victory in the former Republican stronghold.[191] Even in southern states where Obama was unsuccessful, such as Georgia and Mississippi, due to large African American turnout he was much more competitive than John Kerry in 2004.[192][193]

Then the PEW Research center published this [pewresearch.org] which also puts the number of black voters who voted for the Idiot In Charge at 95%

Finding this data took every bit of 5 minutes ... and your point in asking for verification is what exactly