Since Reconstruction in Mississippi — the state with the highest percentage population of African-Americans — there has not been a single black statewide office holder.

…The framers explicitly stated, “It is the manifest intention of this Convention to secure to the State of Mississippi ‘white supremacy,’ ” according to the journal of the proceedings.

…To that end, they adopted a two-tiered path to win statewide office, like governor or attorney general. Candidates must get both a majority of the popular vote, and win in a majority of Mississippi’s 122 state house districts, (only 42 of which are majority black). Otherwise, the state house of representatives gets to decide who wins.

Black Voters Sue Over Mississippi’s Jim Crow-Era Election Law : NPR