By Katie Kerwin McCrimmon COLORADO SPRINGS – National leaders will be watching an ambitious experiment beginning at 11 sites across Colorado that aims to revolutionize and integrate long-separated primary care and mental health. As the economy continues to falter while health costs climb, Colorado alone could save an estimated $3 billion a year by giving integrated behavioral and medical care to people with complex illnesses, according to Steve Melek, a Denver actuary from Milliman, an international actuarial and consulting firm. The new program is called Advancing Care Together (ACT). It is bringing integrated care to adults and children in test…