Not so long ago, talk-radio aficionados even slightly to the left of John Wayne were pretty much out of luck in these parts. After all, most attempts to broaden the spectrum -- e.g., KNRC -- have ended badly. It's too early to say if AM 760 will reverse this trend, but the station has a better chance than most of its predecessors thanks to Clear Channel, its deep-pocketed and generally conservative corporate parent. Meanwhile, local libbies can enjoy Jay Marvin and high-profile fare from Air America that would otherwise only be available online.