When Michael Bloomberg was in the final stretch of the 2001 mayor's race, the billionaire Republican's TV ads warned that his Democratic foe, if elected, would wreck the City Hall of then-Mayor Rudolph Giuliani. But once in office, Bloomberg reversed course on dozens of Giuliani policies and practices, even as he sought to avoid directly antagonizing the ex-mayor. "At the beginning everything is couched in terms of what your predecessor would do,” Bloomberg said in an interview. "And with time, nobody asks. They understand that you have your own style.” "Look -- I think when you look back, Rudy Giuliani...