LOUISVILLE, Ky. — A horse with a humble pedigree. A couple of working-stiff owners. A 77-year-old trainer with his first Kentucky Derby horse.Even Hollywood couldn’t have made this up. California Chrome made it look easy on Saturday, pulling away down the stretch to win the Derby by 1 3/4 lengths. In a sport dominated by wealthy owners and regally bred horses from Kentucky’s bluegrass country, owners Perry Martin and Steve Coburn bred an $8,000 mare to a $2,500 stallion to produce the winner of the world’s most famous race with their one-horse stable.“This is just a dream come true and a great birthday present,“’ said Coburn, who turned 61 on Saturday. California Chrome ran 1 1/4 miles in 2:03.66 and paid $7, $5.60 and $4.20. The chestnut colt was sent off as the 5-2 favorite by the crowd of 164,906, the second-largest in the Derby’s 140-year history.His trainer, Art Sherman, became the oldest trainer to win the Derby, 57 years after he traveled from California as an exercise rider for Derby winner Swaps. He watched that race from the barn area; this time he smelled red roses in the winner’s circle. Sherman was all smiles after the race. “He gave me the biggest thrill I ever had in my life,” he said. California Chrome has the unlikeliest pedigree for a Derby champion. His mother, named Love the Chase, won just one race. She was purchased by Coburn and Martin, a move that prompted a trainer to call them “dumb a--es” for getting involved in racing. Feeling inspired, they named their operation DAP Racing, short for Dumb A-- Partners. Their silks include an image of a donkey. Coburn is a press operator for a company that makes magnetic card strips. Martin runs a laboratory that tests air bags and medical equipment.Sherman visited Swaps’ grave near the Derby museum earlier in the week and whispered a prayer: “I hope he’s another Swaps.” He sure was. California Chrome extended his winning streak to five races, won by a combined 26 lengths. It was the second Derby win for Espinoza, who rode War Emblem to victory in 2002. “I thought he rode him perfect,” said Sherman, a former jockey. “I was riding the last 70 yards with Victor, so I think he was riding two. He had a lot of weight on him, I can tell you that.” Espinoza had California Chrome sitting comfortably in third in the 19-horse field as Uncle Sigh and Chitu set the early pace. California Chrome made his move on the final turn to become the first California-bred to win the Derby since Decidedly in 1962. Commanding Curve, a 37-1 shot, rallied for second, with Danza third. Wicked Strong was fourth and Samraat finished fifth. Commanding Curve returned $31.80 and $15.40, giving trainer Dallas Stewart his second straight runner-up finish with a double-digit longshot. Danza, named for actor Tony Danza of Who’s the Boss? fame, paid $6 to show as the 8-1 third choice. Trainer Todd Pletcher came up empty with his four starters, finishing third with Danza, 10th with We Miss Artie, 12th with Intense Holiday and 17th with Vinceremos. Before the Derby, Coburn had told anyone who would listen that California Chrome “would go down in history.” “I believe this horse will win the Triple Crown,” he said, something that hasn’t been done since 1978, when Affirmed swept the Derby, Preakness and Belmont in a five-week span.