No surprises for any of those on where Obama and Clinton do better than each other, except Mississippi and maybe Texas.
One explanation on Mississippi is turnout, When its all set and done white voters in Mississippi will voter overwhelmingly for McCain no matter who the Dem candidate is, black voters will vote overwelmingly for either Obama or Clinton. However, turnout among African Americans will be higher wirth Obama than Clinton which would make the state closer, still not enough to win because the white vote will be too strong for McCain.