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LOUISVILLE — For 17 years, Cesar has risen at 4 a.m. to work in a barn behind the Churchill Downs racetrack, tending to the prize thoroughbreds assigned to him: icing and wrapping their legs, washing them down after practice runs, raking their stalls.
Like scores of other so-called backstretch workers preparing for next month’s Kentucky Derby, Cesar—one of his given names—is in the U.S. illegally. He lives on the racetrack grounds…