In the predawn darkness Saturday, around 4 a.m., staff with the Architect of the Capitol bolted the bronze plaque to a granite wall near an entrance on the west front, close to where the armed crowd had amassed and scaled scaffolding set up for the inauguration. They wheeled the plaque, stored in plywood, across the stone basement floor and guided it through the double doors. They raised the tribute with a jack table and began bolting it to the wall, the clang of their tools ringing out through otherwise empty hallways.