Throwing even the liberal radio network's most stubborn defenders for a curve, Air America Radio President Gary Krantz was abruptly shown the door yesterday. And not only do we have exclusive details to report on his sacking, it's a great time to share with readers his recent anti-Radio Equalizer campaign. Following a recent pattern of executive departures, including now- former CEO Danny Goldberg, his sudden removal has been shrouded in mystery. While his contract was in fact due to expire, there was no indication he would face immediate termination. And in a departure from the past, the press announcement was...