Answer:

IDITAROD

Answer	Crossword Clue
IDITAROD	March race
IDITAROD	Race that once began in Wasilla
IDITAROD	Mushers' race

IDITAROD	Event Susan Butcher won four times
IDITAROD	Race with dogged determination?
IDITAROD	Annual Alaskan sled race
IDITAROD	Musher's race
IDITAROD	Race for cross-country sledders
IDITAROD	Alaskan race
IDITAROD	Annual race in Alaska
IDITAROD	Race in which everyone dogs it

IDITAROD	Annual Alaskan sled-dog race
IDITAROD	"The Last Great Race on Earth"
IDITAROD	Alaskan race underway this week
IDITAROD	1,100-mile run
IDITAROD	Race that takes a northern trail in even years and a southern trail in odd years
IDITAROD	Dashing through the snow?
IDITAROD	Susan Butcher's event
IDITAROD	Alaskan sled race

IDITAROD	Alaskan trek
IDITAROD	Annual race of mushers
IDITAROD	Dog days of winter?
IDITAROD	Northern race