U.S. athlete Carrie Johnson will race in both the 200 and the 500-meter sprint kayak races in her third and final Olympics this year. Although she has yet to earn a medal in the previous Olympic Games, she's determined to finish strong despite struggling with Crohn's disease. CNN's Rob Marciano brings Johnson's story to Early Start this … Continue reading Sprint kayaker overcomes disease to compete in the Olympics – Rob Marciano reports