From USA Today It keeps getting better for Queen Elizabeth II: Her horse won an historic Gold Cup race at Ascot today, the first time in the two centuries of the race it has been won by a reigning monarch. The horse-loving queen, widely respected as an expert on horse breeding and racing, appeared to be delighted as she accepted the Gold Cup after her horse, Estimate, romped to victory at Royal Ascot, the annual five-day horse-racing extravaganza that brings out brightly-plumed royals and toffs alongside ordinary punters. “One has won!” exclaimed the cheeky Daily Mail headline. The BBC, ever…