The tradition of "pardoning" White House turkeys has been traced to President Abraham Lincoln's 1863 clemency to a turkey recorded in an 1865 dispatch by White House reporter Noah Brooks, who noted, "a live turkey had been brought home for the Christmas dinner, but [Lincoln's son Tad] interceded in behalf of its life. . . . [Tad's] plea was admitted and the turkey's life spared."
Which president started the tradition of pardoning the Thanksgiving turkey?