Rain clouds roll past Belmont Park as an exercise rider takes a thoroughbred out for a workout in the track, June 4, 2014, in Elmont, New York. Kentucky Derby and Preakness Stakes winner California Chrome will attempt to become the first Triple Crown winner since Affirmed in 1978 when he races in the 146th running of the Belmont Stakes horse race.
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California Chrome, winner of the 2014 Kentucky Derby and Preakness Stakes, makes his way back to his barn after morning workouts at Belmont Park in Elmont, New York, June 6, 2014.
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Ali Shepard, of Alexandria Va., watches the infield before the 139th Preakness Stakes horse race at Pimlico Race Course, Saturday in Baltimore.
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Winslow Townson/USA TODAY/AP
Victor Espinoza aboard California Chrome crosses the finish to win the 139th Preakness Stakesat Pimlico Race Course, May 17, 2014.
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California Chrome, ridden by jockey Victor Espinoza, wins the 139th Preakness Stakes horse race at Pimlico Race Course in Baltimore.
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Randall Cooper of Baltimore wears a horse-themed bow tie at Pimlico Race Course in Baltimore before the 139th running of the Preakness Stakes horse race.
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Tommy Gilligan/USA TODAY/AP
Horse race down the front stretch during the ninth race of the day before the 139th Preakness Stakes at Pimlico Race Course.
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Rain runs down a pane of glass as a woman aboard a pony waits to guide a horse off the track during a workout session at Pimlico Race Course in Baltimore, May 16, 2014. The Preakness Stakes horse race is scheduled to take place on Saturday, May 17.
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Kentucky Derby winner California Chrome is bathed after a workout at Pimlico Race Course in Baltimore, May 14, 2014.
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Assistant trainer Alan Sherman, left, stands alongside Kentucky Derby winner California Chrome, with exercise rider Willie Delgado aboard, before a workout on a foggy day at Pimlico Race Course in Baltimore, May 15, 2014.
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Exercise rider Abel Flores takes Kentucky Derby hopeful Tapiture for a morning workout in the rain at Churchill Downs on April 28, 2014, in Louisville, Ky.
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Jockey Corey Nakatani shows his daughter Lilha Kentucky Derby hopeful Dance With Fate after a morning workout at Churchill Downs on April 30, 2014, in Louisville, Ky.
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Tommy Gilligan/USA TODAY/AP
William Delgado and Kentucky Derby winner California Chrome walk onto the track for the morning workout in preparation for the Preakness Stakes at Pimlico Race Course.
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Frank Ortiz wears a horse head as he makes his way to the infield before the 140th running of the Kentucky Derby horse race at Churchill Downs Saturday, in Louisville, Ky.
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A woman watches morning workouts at Churchill Downs on April 29, 2014, in Louisville, Ky.
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Brian Spurlock/USA TODAY/Sports NPStrans/TopPic
California Chrome jockey Victor Espinoza (5) celebrates after winning the 2014 Kentucky Derby in Louisville, Ky., Saturday.
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Exercise rider William Delgado takes Kentucky Derby entrant California Chrome for a morning workout during a morning workout at Churchill Downs on May 2, 2014, in Louisville, Ky.
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Joel Rosario, riding Orb, reacts after winning the 139th Kentucky Derby at Churchill Downs, May 4, 2013, in Louisville, Ky.
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Kentucky Derby hopeful Vicar's in Trouble gets a bath after a morning workout at Churchill Downs on April 29, 2014, in Louisville, Ky.