Ford's Theatre, where President Abraham Lincoln was fatally shot, undergoes renovation in Washington Thursday, Dec. 11, 2008. (AP Photo/Jacquelyn Martin)
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It was there that 15 members of the King and Williams families lived together in three rooms on the second floor of a building located behind the red-brick house. They were considered the property of John Gadsby, owner of the National Hotel in the 1800s. Gadsby was said to have made a fortune in the slave trade.

A 2002 renovation uncovered the original floor, walls and fireplaces of the slave quarters, which are on view in the exhibit, "The Half Had Not Been Told Me: African Americans on Lafayette Square." The title of the exhibit is drawn from a Frederick Douglass quote; the show remains on view through at least March. Reservations are recommended for the $5 tour. "Certainly, given the magnitude of the new president that's coming, this is a really special place," Malinick said.

Obama visited the home in February to film a campaign commercial during the primaries held in the District of Columbia, Maryland and Virginia.

"Tell me about this place," Malinick recalled Obama saying while he had time to look around.

"And I said, 'Well, Senator Obama, you're actually standing in the slave quarters of Decatur House.'"

"Really?" he said.

"He was just very interested, but nonplussed by it one way or another," Malinick said.

The exhibit features a cane used by Douglass, who was an abolitionist, that is carved with images from his life, progressing from slavery to a presidential appointment as the U.S. Marshal. Other objects include a painting of Lillian Evanti, the first black person to perform with a major European Opera, and a quilt made by Elizabeth Hobbs Keckly, a free black woman who was a seamstress for Mary Todd Lincoln.