KNRC, which debuted last summer, hasn't yet challenged the hegemony of the assorted Clear Channel outlets that dominate the local news-talk market. But Greg Dobbs, a former ABC-TV correspondent who manned a talk-show for KOA during the '90s, is certainly doing his part. His morning-drive offerings are consistently intelligent and wide-ranging, providing substantive discussions about topics obvious and obscure. In addition, Dobbs serves as the host of State of Colorado, a Friday morning KNRC discussion show derived from a longtime Channel 6 staple. The program works far better on radio than it ever did on TV -- and Dobbs has made the transition just as well.