IRVINE, Calif.--(BUSINESS WIRE)--Amy Purdy, who last year inspired millions both with her medal-winning performance at the Paralympic snowboarding competition in Sochi and with an emotionally breathtaking series of performances on “Dancing With the Stars” culminating in a second place finish, is taking on a new challenge. Purdy is leading the charge against a proposed Medicare change that could limit amputees from getting the prosthetic care they need. A public outreach campaign has been launch