Clear Channel Radio changed the content of WAVZ-AM (1300) this week, from the likes of Al Franken and "The Voice" progressive talk to Dan Patrick and ESPN Radio sports talk. And some listeners are expressing dismay that the format was changed without on-air notice. The station has had previous stints in sports talk, nostalgic music and (way back) Top 40 music, but for the past two-plus years featured political material from a rare vantage point on AM radio — left of center. The station’s ratings weren’t very good, but some who enjoyed recent programming of the 1,000-watt station — operated...