Philip Johnson of Barrington thinks it's "an unmitigated disaster." Rosalie Nocera of Providence thinks it's "excellent, excellent!" They're radio listeners talking about Air America, the liberal talk-show network that showed up on local news/talk station WHJJ-AM (920) Oct. 15. Nocera and Johnson both wrote to the station to express their strong feelings about the new format. Carrying Air America was a risky move, particularly for a station that had been airing conservative local talk host John DePetro from 10 a.m. to 2 p.m. DePetro dubbed himself "The Independent Man," but when it came to national politics, he was a consistently...