Horse racing is quite a popular sport in the United States, but the growth of the sport and its current popularity are not the same in every state. Why? Well, for a couple of reasons, the biggest one being the legalization of pari-mutuel betting. Some states shined a green light on wagering on horse racing, while others are still in the grey area. Idaho, known for its potatoes, awesome road trips, and… horse racing tracks? You bet! Surely it might not create the same enthusiasm as the Kentucky Derby odds by TwinSpires, but they still have some interesting races and events. If you’re looking to spice up your usual Idaho itinerary of…