Twenty years ago, radio in Michigan was dominated by WJR-AM, which had the strongest signal around. You could get it nearly anywhere in the state. The station’s signature personality was the legendary J.P. McCarthy, who was an amazing interviewer. Politically, I suspect he was conservative, but it was hard to tell; he interviewed politicians of all flavors with decency, courtesy and wit. But then, J.P. suddenly died. Today, he has been succeeded by the sort of ideological slashers who have given talk radio a bad name.