Lincoln's ghost was very active during the administration of Franklin Roosevelt. He used the Lincoln bedroom as a study for his wife Eleanor. The former first lady never saw Lincoln however, she reported that while she was in that room she could feel a presence watching her and she felt that it was Lincoln. President Lincoln's ghost was reported by a young clerk in the Roosevelt administration. The clerk reported that he saw president lincoln sitting on a bed and removing his boots. Sometime during 24 June - 11 August of 1942 Queen Willhelmina of The Netherlands while in a room at the white house as a guest of the Roosevelt's when she reported hearing a knocking on the door from the room she was at and when she answered the door, the queen said she saw President Lincoln from across the hall. Calvin Coolidge's wife has said she has seen Lincoln's ghost staring out of a oval office window.
Winston Churchill stepped out of his bath while staying at the white house one night during WW2, very likely during his visit in May 1943, Churchill was walking naked from the bathroom to the adjoining bed room, He was indeed surprised to see Abraham Lincoln standing at the fire place in the bedroom.
In recent years during the Reagan Administration (1981-1989) there was some incidences related to the Ghost of Lincoln, Maureen Reagan, the daughter of President Reagan has mentioned that she saw the Ghost many times, and also their dog would refuse to enter Lincoln's bedroom standing outside the door barking.