Let it snow, let it snow ... the marathoners will still turn out to run the annual Groundhog Day Marathon in Grand Rapids, Mich.

What's the attraction for runners to come out to the Groundhog Day Marathon in Grand Rapids, Mich.? Knee-high snow, temperatures usually in the low teens and horrible times, plus hot chili, hot chocolate and cold beer. It's a marathon for "crazy people." My story for ESPN.com's Endurance Sports section. http://espn.go.com/sports/endurance/story/_/id/12247375/endurance-sports-groundhog-day-marathon-takes-tough-weather-looping-course-super-bowl-sunday