PERHAPS IT’S THE pure Midwestern water, the down-to-earth roots that dissolved the host/guest desk protector between this arcane pair and moved them into the Friend Zone. Bill was Dave’s first and last scheduled Late Show guest. A place of honor not to be ignored. Murray, famously elusive and quirky, is just as famously close with his Chicago-area extended family, so in 2003, when his friend Dave mentioned after one of Bill’s 44 visits that baby Harry would be christened that weekend, Bill made sure the Murray family christening gown arrived about an hour later. Dave, with wife Regina and son Harry, has since returned the gesture, opening the gate to his Montana ranch and sharing a fishing pole or two on more than one occasion.