Defending champion Dallas Seavey, left, signs an autograph for Bunky Nistler of Beach, N.D., before the ceremonial start of the 2013 Iditarod Trail Sled Dog Race in Anchorage, Alaska on Saturday, March 2, 2013. The race, which will take mushers about a thousand miles across the Alaska wilderness, starts Sunday, March 3, 2013, in Willow, Alaska. (AP Photo/Mark Thiessen)

Associated Press
Defending champion Dallas Seavey, left, signs an autograph for Bunky Nistler of Beach, N.D., before the ceremonial start of the 2013 Iditarod Trail Sled Dog Race in Anchorage, Alaska on Saturday, March 2, 2013. The race, which will take mushers about a thousand miles across the Alaska wilderness, starts Sunday, March 3, 2013, in Willow, Alaska. (AP Photo/Mark Thiessen)
Defending champion Dallas Seavey, left, signs an autograph for Bunky Nistler of Beach, N.D., before the ceremonial start of the 2013 Iditarod Trail Sled Dog Race in Anchorage, Alaska on Saturday, March 2, 2013. The race, which will take mushers about a thousand miles across the Alaska wilderness, starts Sunday, March 3, 2013, in Willow, Alaska. (AP Photo/Mark Thiessen)
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