2010 census shows 96% of the population as White and less than 1% African American - drugs/alcohol and/or mental illness play a huge role in this story I am betting.
I agree. Just the fact that the couple is married makes African American very unlikely.
Your numbers on racial makeup of the United States are totally wrong. Click link below to see racial makeup by nation and states.
http://kff.org/other/state-indicator/distribution-by-raceethnicity/