When will Mississippi turn blue?

[Death of a Salesman]

When there's a radical party realignment and Republicans start winning New Jersey. Under the current party system, never. The GOP wins it by comfortable margins currently, exit polls show that every age group voted for Trump, migration into the state is generally conservative/migration out is generally liberal, and white Mississippians (which is still 90% Republican), has more kids than black Mississippians.

[Death of a Salesman]

Not until whites starting voting more Democratic (only 18% there voted for Biden) and/or more Democratic leaning voters move into the state.

It's closer to 10%, the 2020 exit poll substantially underestimated black turnout. MS has basically zero attractive industries for liberal professionals, so white immigration to MS is mostly conservative retirees.