Dogs on the team of Anna Berrington run in the ceremonial start of the Iditarod Trail Sled Dog Race Saturday, March 2, 2013, in Anchorage, Alaska. The competitive portion of the 1,000-mile race is scheduled to begin Sunday in Willow, Alaska. (AP Photo/Dan Joling)

Associated Press
Dogs on the team of Anna Berrington run in the ceremonial start of the Iditarod Trail Sled Dog Race Saturday, March 2, 2013, in Anchorage, Alaska. The competitive portion of the 1,000-mile race is scheduled to begin Sunday in Willow, Alaska. (AP Photo/Dan Joling)
Dogs on the team of Anna Berrington run in the ceremonial start of the Iditarod Trail Sled Dog Race Saturday, March 2, 2013, in Anchorage, Alaska. The competitive portion of the 1,000-mile race is scheduled to begin Sunday in Willow, Alaska. (AP Photo/Dan Joling)
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