Broadcast network news division chiefs walked the corridors of their newsrooms yesterday, little flecks of foam about their mouths, muttering Macbeth's "life's but a walking shadow" gag, upon learning that Idaho Sen. Larry Craig's very first network TV interview since his June arrest for allegedly soliciting sex in an airport men's room had attracted only 5.7 million viewers to NBC's "Matt Lauer Reports" Tuesday night. The Golden Age of Washington Political Sex Scandals Goosing Network News Numbers -- over. Lauer had given his all for the prime-time interview about what he called "the most famous bathroom stop of the last...