Horse Racing Odds and News Idiomatic Dominates Spinster Stakes, Prepares for Breeders' Cup Distaff   Juddmonte homebred champion mare Idiomatic solidified her place with a commanding win in the $600,000 Spinster Stakes (G1) at Keeneland on October 6.    The victory marked her second consecutive triumph in this event, setting her up for a high-stakes showdown in the $2 million Breeders’ Cup Distaff (G1) at Del Mar on November 2.