Rocky Mountain lows

Bob Beauprez, Republican candidate for governor in Colorado, has attacked his opponent Bill Ritter for plea bargaining criminal charges against aliens to misdemeanors that allowed them to remain in the country when the original charges would have required deportation. A local TV channel has revealed that the case records were disclosed by "a federal law enforcement agent from Colorado." I can't really see why there's anything wrong with that. Aren't court records public?