The five gubernatorial candidates running in the D-F-L primary debated the issues on the Minnesota News Network last night. They weren't allowed to mention Republican candidate Norm Coleman, so they criticized frontrunner Skip Humphrey on his tax cut plan, abortion and stadium funding. Minnesota Public Radio's Laura McCallum reports... The five agree on many issues - they support tax cuts, more spending on education and health care, and the need to end Northwest Airlines' dominance in Minnesota. They oppose using taxpayer dollars for a new Twins stadium. But in a competitive five-way race, they need to distinguish themselves from their primary opponents without bloodying each other an