Arkansas is not formally among the states written off so far by Obama. But I think that's only a technicality. This link mentions the sad polling that says Obama would be enjoying a much broader lead now but for one fact -- pigmentation.
Here's a summary of that poll:
Deep-seated racial misgivings could cost Barack Obama the White House if the election is close, according to an AP-Yahoo News poll that found one-third of white Democrats harbor negative views toward blacks—many calling them "lazy," "violent" or responsible for their own troubles.