Dallas Seavey leaves White Mountain, Alaska on Tuesday, March 17, 2015 during the Iditarod Trail Sled Dog Race on Tuesday, March 17, 2015. Seavey left the checkpoint with a comfortable four-hour lead. Dallas Seavey has won his third Iditarod in the last four years, beating his father, Mitch, to the finish line in Nome early Wednesday after racing 1,000 miles across Alaska. (AP Photo/Alaska Dispatch News, Loren Holmes ) . , APTOPIX