Bush did not win 87% of the white vote in either Tenn or Miss. In Tenn, maybe about 15% of the voters are black. In Miss, maybe 35%. You do the math, assuming maybe 10% of the black vote went to Bush.
87% of whites in Tenn did not vote for Bush, or anywhere close to it, nor did they in Miss, although in the latter it was probably 80%.
Who did they vote for, then?