Democrat Scott Colom won a stunning upset in ​Mississippi's ​US Senate race ​on Wednesday after days of ⁠counting, US media projected, defeating Republican incumbent Cindy ⁠Hyde-Smith to become the Southern ​state's first Black senator since the Reconstruction era that followed the Civil ⁠War.It was one of the final outstanding races to be called since Tuesday's elections, in which Democrats overwhelmed Republicans to win control of both…