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Some jockeys watch as Kentucky Derby hopeful Oxbow walks to the track for a workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/David Goldman) ( APTOPIX Kentucky Derby Horse Racing )

Exercise rider Emerson Chavez rides Kentucky Derby hopeful Golden Soul for a workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/David Goldman) ( Kentucky Derby Horse Racing )

Kentucky Derby hopefuls Falling Sky, left to right, Charming Kitten and Black Onyx go for a morning workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/Charlie Riedel) ( APTOPIX Kentucky Derby Horse Racing )

Police stand guard outside the barn of Kentucky Derby hopeful Overanalyze at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/David Goldman) ( Kentucky Derby Horse Racing )

Part-owner of Kentucky Derby hopeful Goldencents Rick Pitino, left, talks to jockey Kevin Krigger at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/Garry Jones) ( APTOPIX Kentucky Derby Horse Racing )

LOUISVILLE, KY - MAY 01: Race fans watch horses train in preparation for the 2013 Kentucky Derby at Churchill Downs on May 1, 2013 in Louisville, Kentucky. (Photo by Rob Carr/Getty Images) ( 167844582 )

Exercise rider Humberto Zamora rides Kentucky Derby hopeful Verrazano for a workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/Morry Gash) ( Kentucky Derby Horse Racing )

LOUISVILLE, KY - MAY 01: Revolutionary trains on the track in preparation for the 2013 Kentucky Derby at Churchill Downs on May 1, 2013 in Louisville, Kentucky. (Photo by Rob Carr/Getty Images) ( 167844196 )

Exercise rider Maurice Sanchez rides Kentucky Derby hopeful Mylute for a workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/David Goldman) ( Kentucky Derby Horse Racing )

Female jockey Rosie Napravnik takes a second from racing to field questions from the media at the Kentucky Derby Museum Wednesday, May 1, 2013 in Louisville, Ky. Napravnik, 25, is trying to become the first female jockey to ever win the historic race and should she win, SNICKERS will give away 1 million of their new SNICKERS Bites for free.† (Brian Bohannon/AP Images for Mars Chocolate North America). ( SNICKERS Bites - Kentucky Derby Launch with Rosie Napravnik Day 2 )

LOUISVILLE, KY - MAY 01: Falling Sky is walked to the track for training in preparation for the 2013 Kentucky Derby at Churchill Downs on May 1, 2013 in Louisville, Kentucky. (Photo by Rob Carr/Getty Images) ( 167840261 )

People watch as horses take to the track for a morning workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/Garry Jones) ( Kentucky Derby Horse Racing )

LOUISVILLE, KY - MAY 01: Goldencents gets washed in the barn area during the morning training for the 2013 Kentucky Derby at Churchill Downs on May 1, 2013 in Louisville, Kentucky. (Photo by Andy Lyons/Getty Images) ( 167842638 )

LOUISVILLE, KY - MAY 01: Normandy Invasion gets a bath after training in preparation for the 2013 Kentucky Derby at Churchill Downs on May 1, 2013 in Louisville, Kentucky. (Photo by Rob Carr/Getty Images) ( 167840252 )

Exercise rider Emerson Chavez waits to take Kentucky Derby hopeful Golden Soul for a workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/Morry Gash) ( Kentucky Derby Horse Racing )

Steam rises as horses are washed after their morning workouts at Churchill Downs Tuesday, April 30, 2013, in Louisville, Ky. (AP Photo/Charlie Riedel) ( Kentucky Derby Horse Racing )

Steam rises from a horse as it is washed in the barn area during morning training in preparation for the 2013 Kentucky Derby at Churchill Downs on April 30, 2013 in Louisville, Kentucky. (Photo by Andy Lyons/Getty Images) ( 167800017 )

A hot walker takes a horse out grazing at Churchill Downs Monday, April 29, 2013, in Louisville, Ky. (AP Photo/Morry Gash) ( Kentucky Derby Horse Racing )

Exercise rider Cassie Garcea rides Kentucky Derby hopeful Falling Sky for a workout at Churchill Downs Tuesday, April 30, 2013, in Louisville, Ky. (AP Photo/David Goldman) ( Kentucky Derby Horse Racing )

Exercise rider Obed Perez rides Kentucky Derby hopeful Overanalyze for a workout at Churchill Downs Tuesday, April 30, 2013, in Louisville, Ky. (AP Photo/David Goldman) ( Kentucky Derby Horse Racing )

Kentucky Derby hopefuls take to the track for a morning workout at Churchill Downs Tuesday, April 30, 2013, in Louisville, Ky. (AP Photo/Garry Jones) ( Kentucky Derby Horse Racing )

Verranzano (left), ridden by Humberto Zamora, works alongside a workmate during the morning exercise session in preparation for the 139th Kentucky Derby at Churchill Downs on April 27, 2013 in Louisville, Kentucky. (Photo by Matthew Stockman/Getty Images) ( 167657230 )

Trainer Rudy Rodriguez rides Kentucky Derby entrant Vyjack for a workout at Churchill Downs Monday, April 29, 2013, in Louisville, Ky. (AP Photo/Charlie Riedel) ( Kentucky Derby Horse Racing )

Kentucky Derby hopeful Orb is washed down by his grooms after galloping on the track during early morning workouts at Churchill Downs in Louisville, Kentucky, April 29, 2013. REUTERS/John Sommers II ( HORSERACING-KENTUCKY/ )

Steam rises of a horse names Strike the Note as it is washed after a morning workout at Churchill Downs Tuesday, April 30, 2013, in Louisville, Ky. (AP Photo/David Goldman) ( Kentucky Derby Horse Racing )

A worker holds a horse called Fan Fair after it's morning workout at Churchill Downs Tuesday, April 30, 2013, in Louisville, Ky. (AP Photo/David Goldman) ( Kentucky Derby Horse Racing )

Horses leave the track after an early morning workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/Charlie Riedel) ( Kentucky Derby Horse Racing )

Horses are washed after their morning workouts at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky. (AP Photo/Charlie Riedel) ( APTOPIX Kentucky Derby Horse Racing )