THe morning after Louisiana’s House primaries were scheduled to take place, worshipers at Mount Zion First Baptist Church in Baton Rouge were on their feet, swaying to the gospel music that vibrated through the wooden pews. Just days earlier, the vote had been abruptly postponed as Republicans scrambled to redraw congressional boundaries in a way that would erase one of the state’s two majority-Black congressional districts and dilute the political influence that many in the congregation had