ANCHORAGE, AK (AP) — An Alaska musher leads the world’s most famous sled dog race in the push to the finish. Pete Kaiser, from Bethel, Alaska, was the first musher to leave the checkpoint in White Mountain, at 4:05 p.m. Tuesday. All mushers must take a mandatory eight-hour break at White Mountain before making a final 77-mile push to Nome in the 1,000-mile Iditarod Trail Sled Dog Race. Kaiser and defending champion Joar Ulsom of Norway are fighting for the lead. Ulsom arrived in White Mountain 41 minutes after Kaiser earlier Tuesday. Frenchman Nicolas Petit lost the lead and the race when his dog team quit running Monday. Petit later withdrew and his dogs were transported off the trail by snowmobiles. The winner is anticipated in Nome sometime today.