AC, Mississippi’s black percentage of the population in the 1990 Census was 35.6%; in the 2000 Census it was 36.3%; and in the 2008 Census Estimate it was 37.2%. So, no, the 2010 Census won’t show MS with anywhere near a 42%-45% black population. And as for MS voting Democrat for president by 2028, it would take a major realignment of the white Southern vote for that to happen, because the state is nowhere close to voting Democrat for president despite blacks voting 95% Democrat.
I’m not a demographer but I don’t foresee a huge black demographic boom in MS. Baring something like that I think it’s a matter of time before the GOP wins at the local level. It’s already taken much longer than we’d like and may take quite a while more but I foresee white southerners becoming increasingly hostile to the rat party.