In building an armed camp to protect themselves, Democrats implicitly endorse the case for D.C. remaining a federal district and not a state.When riots swept the nation’s capital on Jan. 6, 2021, National Guard troops were called up to help keep the peace. Two months later, they’re still there. The Capitol Building remains surrounded by a seven-foot fence. The area looks more like an occupied capital in one of our small wars of empire than the seat of government in the land of the free. That said, if anyone is going to station and control troops in D.C., it probably...