A horse breaks free during a morning workout at Churchill Downs Friday, May 3, 2013, in Louisville, Ky. Saturday will be the 139th running of the Kentucky Derby. (AP Photo/Charlie Riedel)

Associated Press
A horse breaks free during a morning workout at Churchill Downs Friday, May 3, 2013, in Louisville, Ky. Saturday will be the 139th running of the Kentucky Derby. (AP Photo/Charlie Riedel)
A horse breaks free during a morning workout at Churchill Downs Friday, May 3, 2013, in Louisville, Ky. Saturday will be the 139th running of the Kentucky Derby. (AP Photo/Charlie Riedel)
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