In this scenario instead of Lincoln going to Fords Theater he decides to stay in the White House. Andrew Johnson gets offered Lincolns spot and decides to go. Fancying the style of hat Lincoln has he gets one and wears it into the theater. Both being unaware that Lincoln is not in the theater goes through with his part of the plot. He shoots Johnson in the back of the head and leaps from the balcony. Injuring himself like in the original timeline. And as in the original timeline all the conspirators are caught, tried and executed. But now Lincoln knows that a plot to kill him and other officials was alive and well in DC. And he is pissed. What happens from this point forward in the remaining months of the war and the following Reconstruction years?