Amid the sale and retirement of horses, the almost hourly announcement of 2021 stud fees and coronavirus shutdowns at Golden Gate Fields and Zia Park, the New Jersey Racing Commission quietly made a significant move that could bring the sport an overdue shot of momentum. And maybe an overdose of new headaches. The four commission members meeting in a teleconference Wednesday voted unanimously to give fixed-odds wagering a try next year. It would be on certain Grade 1 races that happen in other states between Jan. 1 and Dec. 31. Races like the Kentucky Derby, Preakness, Belmont Stakes and the Breeders’ Cup championships.