Kentucky Derby

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Exercise rider Joel Barrientos takes Kentucky Derby hopeful General a Rod for a morning workout at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (AP Photo/Charlie Riedel)

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An exercise rider takes Kentucky Derby hopeful Hoppertunity for a morning workout at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (AP Photo/Charlie Riedel)

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An exercise rider takes Kentucky Derby hopeful Hoppertunity for a morning workout at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (AP Photo/Morry Gash)

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Exercise rider Abel Flores takes Kentucky Derby hopeful Tapiture for a morning workout in the rain at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (AP Photo/Garry Jones)

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California Chrome is seen from a horse van after arriving at Churchill Downs for the Kentucky Derby in Louisville, Ky., Monday, April 28, 2014. California Chrome has won his last four races by a combined 24 ¼ lengths. (AP Photo/Garry Jones)

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California Chrome arrives at Churchill Downs for the Kentucky Derby in Louisville, Ky., Monday, April 28, 2014. California Chrome has won his last four races by a combined 24 ¼ lengths. (AP Photo/Garry Jones)

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California Chrome is seen from a horse van after arriving at Churchill Downs for the Kentucky Derby in Louisville, Ky., Monday, April 28, 2014. California Chrome has won his last four races by a combined 24 ¼ lengths. (AP Photo/Garry Jones)

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California Chrome walks into Barn 20 at Churchill Downs for the Kentucky Derby in Louisville, Ky., Monday, April 28, 2014. California Chrome has won his last four races by a combined 24 ¼ lengths. (AP Photo/Garry Jones)