'Believe in yourself': Doctor who became a mom at 15 completes goal of running 50 marathons

Dr. Katie Clark, who became a mother at 15, has completed her goal of running a marathon in all 50 states. She finished her 50th race in Wyoming, 21 years after her first marathon.
Twenty-one years after running her first marathon, Dr. Katie Clark crossed the finish line in Wyoming, her 50th state. Her story didn't begin at a starting line.
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