Gov. Tim Pawlenty repeated his opposition Friday to so-called "insurance exchanges," a key piece of health care reform. He said exchanges amount to government interfering with the free market. That's a reversal from 2007, when Pawlenty proposed his own insurance exchange program for Minnesota businesses. Pawlenty says his opposition to exchanges is the reason he declined to send the US Government a state response to questions about exchanges. Three prominent Minnesota health groups secured a copy of the response and sent it anyway. Former GOP senator Dave Durenberger, a health policy expert, says their move was understandable. Pawlenty says a 2008 state analysis of exchanges found they'd be ineffective at reining in costs.