Edsall's column is linked below.
Thomas Edsall: Blacks are losing political power in the South
"Republicans are currently entrenched, backed by decisive majorities of white voters. Republican legislators in the South have, in turn, moved aggressively on two fronts to secure their power: by designing legislative and Congressional districts minimizing Democratic prospects and by moving ahead with legislation designed to suppress voting under the guise of combating voter fraud."
----Thomas Edsall, New York Times