By Katie Kerwin McCrimmon Colorado is flunking when it comes to childrens health and its time to mount an aggressive turnaround campaign. That was one of the key lessons from the release last week of the annual Colorado Health Report Card. Were not growing our own healthy children. Our child obesity rate remains in the middle of the pack, said Anne Warhover, president and CEO of the Colorado Health Foundation, which releases the report card each spring. Thats where the foundation is really going to emphasize more and more of our work in trying to prevent childhood obesity. It leads…