Steam rises off a horse as it gets a bath after a morning workout at Churchill Downs, May 5 , in Louisville, Ky. Charlie Riedel/AP
A horse runs during an early morning workout under the lights at Churchill Downs, May 4, in Louisville, Ky. Morry Gash/AP
A fan holds an umbrella in the rain as he watches horses work out at Churchill Downs, May 3, in Louisville, Ky. Charlie Riedel/AP
Derby Day at Churchill Downs also includes a parade of ladies hats. Newscom
Mares and foals grazed with the farm office in the background at the WinStar Farm, near Versailles, Ky., last year. Newscom
Last year, during the 136th running of the Kentucky Derby at Churchill Downs, Lynette Nelson of Davey, Neb., and Connie Uden of Franklin, Neb., stood in the paddock between races. With hats and dresses covered in plastic, they were more than ready for the rain. ZumaPress/Newscom
Kentucky Derby entrant Dialed In gets a bath after a morning workout at Churchill Downs, May 6, in Louisville, Ky. Ed Reinke/AP
A horse and exercise rider makes their way to the track for a morning workout at Churchill Downs, May 6, in Louisville, Ky. Charlie Riedel/AP
Josh Lile of Louisville, after diving in mud in the infield at the 136th running of the Kentucky Derby at Churchill Downs in Louisville, Ky., in 2010. David Stephenson/Newscom
'Derby Kitten' is placed in the No. 9 starting gate spot at the post position draw for the 137th Kentucky Derby in the Secretariat Room at Churchill Downs in Louisville, Ky., on May 4. ZumaPress/Newscom
Last year's participant, Lookin at Lucky, gets a bath from groom Martin Componsano after a morning workout at Churchill Downs in Louisville, Ky. Garry Jones/AP
Jockey Jon Court, who will ride 'Archarcharch' in this year's Kentucky Derby, is seen in the jockeys room at Keeneland Race Course in Lexington, Kentucky, on April 18. Matt Goins/Newscom
2011 Kentucky Derby participant, Dialed in, wins the Holy Bull Stakes race at Gulfstream Park in Florida on Jan. 30. ZumaPress/Newscom
Obama phoned Russia's Vladimir Putin Thursday to discuss a US proposal for resolving the Ukraine crisis. Earlier, the US moved to begin a regimen of sanctions against Russia. Will those be enough to prevent Russia's annexation of Crimea?
[Updated 9:30 p.m. ET] President Obama appealed to Russian President Vladimir Putin late Thursday, during a personal phone call, to agree to direct talks with Ukraine aimed at resolving, through diplomacy rather than military confrontation, Russia's concerns about the future direction of the Ukrainian government and of the rights of ethnic Russians living in Ukraine.